Malicious PDF — malware analysis report

Static analysis result for SHA-256 4529ea240de7e5e5…

MALICIOUS

PDF

125.1 KB Created: 2021-03-27 15:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a5fc71068c61acee9a2ab49e2be2eba2 SHA-1: 90d2e3a9f05f6129fccccc2aeb96b8493a83fc88 SHA-256: 4529ea240de7e5e547fbdbc47153fb0a37f6d74a89f8102df0110e6ede200fb4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm or phishing lure. It contains numerous embedded URLs, many pointing to disposable hosting services, designed to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest an attempt to leverage external resources for malicious purposes, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/wix?keyword=csr2+world+records+2018 PDF link annotation
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/fiwikabulatava.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/the_hobbit_book_artwork.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/f4db118f782b62a.pdfIn PDF document text
    • http://tamakar.tech/arnold_ehret_dietztdbp.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/b982e344a1.pdfIn PDF document text
    • http://nizeguz.iblogger.org/how_does_detox_tea_help_you_lose_weight.pdfIn PDF document text
    • http://tipografiyav.moscow/what_is_the_best_exercise_for_a_50_year_old_manw11lr.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/7505766.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/zokudunafatalofozawuko2m2pc.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/jexobevez.pdfIn PDF document text
    • http://maewallace.com/how_to_fix_wahl_trimmeredoxj.pdfIn PDF document text
    • http://tihefers.online/fekuzavewosavexesefi6umzg.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_9d8c65993095447daa53f8b48798f739.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/annexure_d_for_passport_format.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/how_to_adjust_ryobi_bp42_carburetor.pdfIn PDF document text
    • http://welavozolin.rf.gd/mewakipixopuvemi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/58272248986.pdfIn PDF document text
    • http://kafopazam.epizy.com/98170127035.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_56cb500ebb524157b03636c2b59d33f3.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_9e94574e6c6944fa9a24812aad243860.pdf?index=trueIn PDF document text
    • http://tosipasakuvil.myartsonline.com/nsfas_application_form_2020_ukzn.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001cdbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CDBD 8292 bytes
SHA-256: 73350812803a8856e49cc026d12ec612f6b543c43f3a1ac8ba6995bc1b8e3200
font_00_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 6408 bytes
SHA-256: dbae57d602991b9716a6821abe8aeaaf8e369c2c93c917f44b111f2e2764e40f
font_01_sfnt_off00013fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDF 6272 bytes
SHA-256: 3b57c6e57782f88de989f4647f0a72cd2e89a892c57e27898026260893e47d2d
font_02_sfnt_off00015510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15510 6168 bytes
SHA-256: d841e6ee9fc5f8d88f1d94419f2a0f587508a927e8deb92e2b18ca34c352e48a
font_03_sfnt_off000164af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AF 5240 bytes
SHA-256: df8ed187d101c7abff85fb43ee16c86d281ff1284eb575ede22e0781b36564f5
font_04_sfnt_off000176a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A1 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_05_sfnt_off00017f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F2C 15528 bytes
SHA-256: 20d13cf30db59bf745da370d6e09c335929a75adf7e64dc9ebf5d265100627d4
font_06_sfnt_off0001b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E5 17628 bytes
SHA-256: 6e93e6a60708d4af0e151dd90abca408205682b29bf7faa5ee43c26caa47837f

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