Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c97e89485dc9e5…

MALICIOUS

PDF

77.5 KB Created: 2021-04-08 23:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 73be2548262edf488f52d1b3806999d7 SHA-1: dee5332797b1b3ca5c0fdc3ef5997aed6e3d0e18 SHA-256: a2c97e89485dc9e574871ab5212b3fc95e4a6251cde6d6630f2ca54f45c52674
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, hosted on disposable domains. This is a common technique for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=which+form+the+boundary+between+europe+and+asia PDF link annotation
    • http://sekujirimabasas.getenjoyment.net/winky_wonky_donkey_book.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/9111611.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/vikemavevewov_kuzalutakuzuj.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/biwaxez-belemotujag-rumedefewe-guwujo.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/Sfgehca/30584272794.pdfIn PDF document text
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/2347231.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/zuxorizezom_vafipagijot.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/lLmJjac/soluwisoj.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/gjggu0r/makeup_memes_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/gj3iihc/best_forex_trading_strategies_2020.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/22623c7b44.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/gcgjwjb/mannipaaya_word_meaning_in_english.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/rorufo.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/dasekini_riseta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_6af9ed38901a40feb818259b5f861f86.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_c833ee2c7c51470c996bc19cc6557e0d.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_c1dda827d6ed42b4b556dfbdc50e84a6.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_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 5712 bytes
SHA-256: e54fa2520d692b8a5f134299c12b5a285153867e78f5d5fc639bb3e643aa7991
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 10820 bytes
SHA-256: 7bb6c2e2a73e46548c80b9c5ab4fd632df059425a9a5e8127cd32c7a21abe83c

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