Malicious PDF — malware analysis report

Static analysis result for SHA-256 274e85b257ea64a4…

MALICIOUS

PDF

89.9 KB Created: 2021-03-28 22:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0e15202b01d52d69586c06eedf1feb1 SHA-1: df0ffcfa765a0c182882d32f46b3138f511d188b SHA-256: 274e85b257ea64a4ef424395351535d333e812aae8ce55c775591c81709a85ce
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://dugedepap.ru/strik?utm_term=what+is+computer+keyboard+in+simple+terms PDF link annotation
    • https://cdn.sqhk.co/pixafosabow/geQhggh/voicethread_app_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/shdhcs7/table_tennis_game_online_multiplayer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_603b3479011ec.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/dichlGM/32792102051.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/e9wUMPX/wajobonabezexuduj.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jjKFi0X/play_super_text_twist_2_free_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_605befe7b5755.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/videSid/jonat.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://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_35e4867e02854ec789286b9f127de869.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_f4c59764f9604067beca234aa8347d70.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_55db9ede94d940139ece922d08b298e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neviwove/mikusutufosakafegaxowibif.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/boy_scout_handbook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/vocabulary_test_elementary_level.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_186c2beec9f84933afb5c48f5015e5db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/diccionario_biblico_nelson.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_a892868734424a25a4ae1813fbb5efed.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_63c9237abcf047e3b5f4037269addd93.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_66912461b9a74b49b04e8fc4d176c6dc.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_dd68d44b5fec4511ab3c51424da9bd56.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_f3202591ef8f4b67bc83c276496dc1d8.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_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 5512 bytes
SHA-256: 903a7c02c776ad9c8fd70c9349068fdc28836eb6e1f346c03094d61ea071bcd4
font_01_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10996 bytes
SHA-256: e40ad5749fe2eb7987cd8c3d959e9361e8750a2c514a27f6829ff9ab76b8de87
font_02_sfnt_off00014be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378