Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c757f91cb0b655e…

MALICIOUS

PDF

96.3 KB Created: 2021-05-27 09:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81146a41bc559614b9c4940be4040ba3 SHA-1: 2815b608c827cddd6d3e3eb63f648bfcdfb71871 SHA-256: 1c757f91cb0b655e5723a97a41b443ad85890ac6dec680ec0eda52a1584d9a14
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link farm domains, suggesting a SEO spam or phishing campaign. The primary malicious URL identified is seumenha.ru, which is likely used to host a phishing page or a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=how+to+play+dragon+ball+z+budokai+tenkaichi+3+on+ps4
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/1252987.pdf
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/2a58413726e356.pdf
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/5355343.pdf
    • https://lupogupep.weebly.com/uploads/1/3/4/4/134444844/vazakazuno_gunudonasin.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/metawejutugowomowad.pdf
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6020fc70b8468.pdf
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/kudugefaj.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_601dc63149bbf.pdf
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/renel.pdf
    • https://kijiwutexaji.weebly.com/uploads/1/3/4/6/134698992/rozusuwup-xurofokakob-wovap-somekimavolokux.pdf
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/vofebidamunufivukato.pdf
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/furajamusuva_wotonu.pdf
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/bixix.pdf
    • https://cdn-cms.f-static.net/uploads/4469850/normal_60525870715f4.pdf
    • https://cdn-cms.f-static.net/uploads/4500692/normal_60121b6567c04.pdf
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/627609.pdf
    • https://jusodudefepad.weebly.com/uploads/1/3/4/6/134650432/bekupetuwebupon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92428c49-3f97-4992-bb4d-6d7ede9fe6ab/64029423636.pdf
    • https://uploads.strikinglycdn.com/files/9ff18842-98f6-4a41-9e07-4e0f4bb3df95/51150541190.pdf
    • https://uploads.strikinglycdn.com/files/091ebf58-5177-4367-abdd-5f9838ac691e/change_the_culture_change_the_game_pyramid.pdf
    • https://uploads.strikinglycdn.com/files/b0f8410e-b2cd-479a-a7b2-d183419650c1/gizifivirip.pdf
    • https://uploads.strikinglycdn.com/files/b468c4d8-328d-4b54-a8c6-e3b9bc2d7d9e/download_game_yugioh_duel_links_mod_apk_2020.pdf
    • https://uploads.strikinglycdn.com/files/41373f0c-8227-48e9-b49f-bcea73fcbd8c/ket_for_schools_practice_tests_students_book.pdf
    • https://uploads.strikinglycdn.com/files/c57b33ea-f9cc-4e85-a9bb-9f9575c8944a/nemep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012427.bin
a563148a19b44d34d3bbb332d2b00f20925eb20bc74195101168db916b025d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 6236 bytes
font_01_sfnt_off0001394b.bin
4627ebc864cb0ab8281c986df347672d66402db91b50b583760b785e07e7a534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 5996 bytes
font_02_sfnt_off00014dce.bin
42ac36d214b8e0fa8c4103483d40af26bec3df150b96fc00093fdc8caad33969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCE 11092 bytes

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