Malicious PDF — malware analysis report

Static analysis result for SHA-256 8751833a2183e733…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 12:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0501f0ecd6d82d5d15616872ceee773b SHA-1: e1247308ec8356621efb9286871687d6863a215f SHA-256: 8751833a2183e733d07ebfaafa5dc6062e83943325389edcfb7a8237daf257e4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/strik?utm_term=farewell+my+lovely+pll PDF link annotation
    • http://balifruit.com/531517489385542s.pdfIn PDF document text
    • http://firstreadersclub.com/airplane_movie_autopilot_deflateswc0tz.pdfIn PDF document text
    • http://ro-shop.space/adistec_brasil_informaticazqmfo.pdfIn PDF document text
    • http://devlp.design/canto_el_pajaro_carpinterootmhj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60243897be3e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_6033166c3301c.pdfIn PDF document text
    • http://mitefakosutupot.22web.org/hotel_franchise_agreement.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484990/normal_5fec89988be69.pdfIn PDF document text
    • http://buloshnaya.site/manijixuragixirupz7lz1.pdfIn PDF document text
    • http://bbcua.site/react_native_android_gradle_cleanb1op8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_60187a5276e5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_d252ffc1c1e54539a00043a1f475247d.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_991a1798294346f783b1a95528e99afe.pdf?index=trueIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_c9a13c2c28fe41e48aa7be4d8d80a82a.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_362cbea5cd8f462c8c7079eee2d5d4ab.pdf?index=trueIn PDF document text
    • http://pisisome.rf.gd/bts_love_yourself_answer_era.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_992aabc57e684c6d8dce028cc2854dca.pdf?index=trueIn PDF document text
    • http://lunodemexixape.epizy.com/m_audio_fast_track_pro_tutorial_espaol.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_fffd22376cc3413ea0b525cc1acba911.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 4996 bytes
SHA-256: 0d941bbf00337b8be31b1d25e8e8269647a8061211708ac6db06436d1c1c510a
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11612 bytes
SHA-256: aad574bbd558a46382f388cfcaa14422525e1d511cd3eb2cb67d1d9ade6d4573

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