Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bd6dda7187148f…

MALICIOUS

PDF

86.2 KB Created: 2021-03-17 10:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 627bddd909da3d21b451cd9dd3c10ddb SHA-1: b129ada6728a8618cacd5c51317ef0c91a33e464 SHA-256: e4bd6dda7187148f45e4a3dc6ea84c2ebea54c8b7cd934d854169d1719380aa2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to manipulate search results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to leverage external links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=dungeon+hunter+3+apk+mod In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488315/normal_5ffdcbb26ead6.pdfIn PDF document text
    • https://putoluxadap.weebly.com/uploads/1/3/4/7/134734973/b5566b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_60472ac62bd18.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/casio_w-800hm-3avdf_erkek_kol_saati.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/d59d477514b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_601b47dc8a72e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fe745ffd73aa.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/110b8b711a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fc6651f75f42.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/lopen.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/xogurixuvaripo-badogavosovibus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_6046db7907399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c636a935-f67d-4291-bfe7-d3374c2169fa/xoribesuviwodopugere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b14300e-eb9f-4486-a6b9-f740315ba1e9/47559052335.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/josipevukatufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccc5270-d3ce-4f21-bb7b-efc57effa0d3/what_are_the_levels_of_comprehension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35ffeda-b2b0-483d-8497-2b807d9c28c6/public_relations_degree_online_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d9bcf5-b58f-4a0d-a6bb-19a5cdb0183f/52139858266.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/manual_para_arduino_en_espaol.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 5388 bytes
SHA-256: d05bb370ded24eb4ee9e9966cacc8a6869f257fff4a576b330758348144e5544
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 11200 bytes
SHA-256: d41ca3815d80888fda6e59baebb1c4faafa8435b28d7a3b18fe81916ff514ee3
font_03_sfnt_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 16172 bytes
SHA-256: 50d3e19168395f864acbebc3a139be41ddb1e3e7d192a04497c5393ce2a5805a

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