Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d3ef4a7c886e93…

MALICIOUS

PDF

104.5 KB Created: 2021-05-09 13:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 48cd3cf6bad44f13821de3d74e9e23d6 SHA-1: 4166a3a36641c4aaea602ac312601d30708abecf SHA-256: 33d3ef4a7c886e9331e47af8f1dbd4dee95ec57b174b42a6a8f6f9148043a314
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest a link farm designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://ponafet.ru/strik?utm_term=how+to+connect+ps3+controller+to+ps4+2020 PDF link annotation
    • http://depalowivejal.iblogger.org/aashiqui_bengali_movie_ankush_hazra.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/7898753.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/jabatexunobujej.pdfIn PDF document text
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/3068722.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/lepob.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/5626965.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/04a3d833-92d0-4134-a8c7-2501ec161c32/adjectives_to_describe_rainsford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7498b82f-53f6-4233-9ff2-a99323f36a4d/jukumewefiseru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f8167c-14a1-4dee-a26d-0366a7801593/the_woman_in_cabin_10_characters.pdfIn PDF document text
    • http://pasibujaz.epizy.com/siluvonuwekati.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_cbff7fc0c4ed436ea8c8d72b89751e60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe563b05-b176-454f-b134-aafaabadfe77/mejutiwe.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_485786d630de4f909c8fbeb37ddaeb7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f869ec5-968c-4841-af04-5499c7c66e13/bozudatagi.pdfIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_769c614821304b57bb20f6c9f240f195.pdf?index=trueIn PDF document text
    • http://legatuwaw.epizy.com/71936380388.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_137f60d4780c4a698c7907c989e588c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/408f459b-fb82-483f-8d8c-1aef2a6d3063/us_marine_corps_workout_routine.pdfIn PDF document text
    • http://mawigugu.rf.gd/how_to_use_garmin_delta_sport_xc.pdfIn PDF document text
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_502e5f095947427f89124ce5e4e22596.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86295594-2d23-4076-aabe-146ac18ad9eb/how_to_install_neat_receipt_scanner.pdfIn PDF document text
    • http://kawurox.epizy.com/opnav_5530_1_rev._jan_2018.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_adf288ce973242b488dc80ae986c02dd.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_69b455af00634d9088f229c38a8876a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a51bd7-a9b1-4838-9258-944c40fe38f6/24742623434.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_8007cbde42804cadb0b82a8b00a7b702.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14846 4288 bytes
SHA-256: a7c32720a5440fe4dfeec01860eb5f4536d451431f89724d1aad6e27611361c1
font_01_sfnt_off0001575d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575D 5296 bytes
SHA-256: e9bbfbe65f26d92c73cb7cce66cdc65638c785615cdb80eb91856fad3ab4a8bd
font_02_sfnt_off00016990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16990 12412 bytes
SHA-256: 6a737e3635e1026cc082d97ac5f1e8949e439c2bf45ab72a03a1766d19a9bb38

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