Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccd4a20ae893658…

MALICIOUS

PDF

92.2 KB Created: 2021-03-15 07:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a9bfc436c9650cbe1b03ff92b745630f SHA-1: 672f6f6126a16354fd55e04e841e785b899a39b9 SHA-256: cccd4a20ae89365896ecca5139146f681e0cf74af1507ac0e45bbdc3bdf7e641
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to 'golowaki.ru', suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated and appears to be a lure for Japanese language learning materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://golowaki.ru/award?keyword=shadowing+let+s+speak+japanese+beginner+to+intermediate+pdf PDF link annotation
    • http://bluhgang.best/20084639978q09si.pdfIn PDF document text
    • http://gagarinski.su/spelljammer_ship_combaththmk.pdfIn PDF document text
    • http://zoomita.space/what_sd_card_does_a_gopro_hero_4_usezn4ql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fe0450964f31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_600364871007e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_602e6f563a559.pdfIn PDF document text
    • http://samelike.site/zopopuvuvapibamezomajpef1m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdc770a-87b4-4116-a06f-abf1e558032a/luwowugif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee1375d-1656-4c62-9ed7-e8453e0e8914/what_is_a_dynamic_stretches.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_c6f83e5c057543719ffce3ffb262634f.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_c153d281a7364b0e9038002cf265e8ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59781e21-0ccc-4a4e-bef2-5ebe0a0850f6/how_much_is_whirlpool_cabrio_washer_and_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/kenadatifupitafada.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_ac82c2b15db645de816127b962135654.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_6a242695e22c4ed6a2fbdea09d8cd269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/71371797870.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/zaboboxijebazebumire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d3c0d4-eaae-4687-b61e-e2b7e636b8b9/nijivipoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b19a5ac-9f10-478b-867d-738cb58ce7c6/kiwifaxabilon.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/11729495603.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/76736390833.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_bbe153c4aa144f31be65feb4486b5105.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_8c2d6cf968a343179cbe506d1036af46.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_76a1b1dc669f453386af885044f1c4f2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 7012 bytes
SHA-256: 64b17598770708986bebc290da8ec6b9f785d867a2e930c56b3b3ab0a875e024
font_01_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 5932 bytes
SHA-256: acb61a6c39c4bcfd63a2d8a2a1b5d826fe3cba7b44b82f3a64618a7e7c83ea69
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 11772 bytes
SHA-256: ac61c9f1dd8a70871e9fb3ee269c87ff881e8cdaf4cf280268f48f464f667d18
font_03_sfnt_off00014cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC0 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c

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