Malicious PDF — malware analysis report

Static analysis result for SHA-256 686206b178ea0028…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 22:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 82674ec818b5c3dba307a49eabe3fc51 SHA-1: f722794e5b7b1e67c005a82a8de4c94be015e1cc SHA-256: 686206b178ea002880d14de89c7a0622597496ac1cb92068e00ae2e2d435b5cb
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to disposable hosting and acting as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'tanatologia catolica pdf' and includes metadata from wkhtmltopdf, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=tanatologia+catolica+pdf PDF link annotation
    • http://usacreditreport.info/what_does_safety_dance_meanv2ig1.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/76177101759.pdfIn PDF document text
    • http://mirror-x.org/783397438901jc5s.pdfIn PDF document text
    • http://ayazshabutdinov.club/facebook_marketplace_ad_hidden_informationuy8yy.pdfIn PDF document text
    • http://hook-up.fun/catalogue_marjane_juin_2020em7zz.pdfIn PDF document text
    • http://krepezh.guru/arifureta_from_commonplace_to_worlds_strongest_manga_english5dr8l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zamuriza/xedidekigamopav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175a2996-5a94-472d-a5e4-50df9185b44b/55006066395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e319ffe4-8bcb-4625-9f74-b200ebd3126d/82456233326.pdfIn PDF document text
    • http://siwodonodefofo.epizy.com/free_assertiveness_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc7d94c-711a-4730-a83b-2919d317b004/32928907654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f3dfa1-938b-4fd0-8ab8-33ec58c9dd0a/rijalubesedojuxabe.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/72998296495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd40a38-7b3c-4900-9473-d99cd77949f4/mamijiranol.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/90619392791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a59b5a7-3afa-4236-80b1-d8c4d97398d4/how_to_read_a_person_like_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb262c3-2d88-49b8-8cb5-5dfca3f2fe19/retesujiwaruvupusoguko.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 4668 bytes
SHA-256: 579f789571361f1aac3e82edd6aac376195828f6aa1eeae6b3a4075911ed4a33
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 13092 bytes
SHA-256: 86114fdd6594275b0827b4a60c4625f0d604adc2d9ed7183e2d65673bf1b4260
font_02_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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