Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ff154539c3617d…

MALICIOUS

PDF

64.8 KB Created: 2021-02-21 19:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 09c7161647aefbcc2fc6a07071eb6763 SHA-1: 23be959a2343f81a54690a9b301f4ab045a11b7d SHA-256: b5ff154539c3617d949540692fb4c654813dd5e2cfa7882e89440c88f4812e1a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, with one URL directly matching a search query. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=how+many+calories+in+a+burger+king+breakfast+burrito+jr PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fdf4d899e9e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_6006598d8247b.pdfIn PDF document text
    • http://cherrypimp.online/149181844067b5i7.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/vovosuko_dosake.pdfIn PDF document text
    • http://senteber.site/nanatsu_no_taizai_ova_en_la_playa_sub_espaolpp6bh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fcce965d8e59.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/gomiguterelosegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fda3ab212a3b.pdfIn PDF document text
    • http://verifybadgehelp.com/firefox_apk_for_jio_phonemhj30.pdfIn PDF document text
    • http://srakan.space/34668082094kkvd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492281/normal_5febf7b73d38a.pdfIn PDF document text
    • http://genusttwsr.fun/46352657879emn3o.pdfIn PDF document text
    • http://secret-empire.ru/mafijamodofasobugubzr0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_6026fd767dd3b.pdfIn PDF document text
    • http://trokot-shtorki.online/authority_and_american_usage_david_foster_wallacepxi45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/litunux/homophones_homonyms_homographs_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/pexuragavidetazufagez.pdfIn 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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 5636 bytes
SHA-256: 08938a529221ae2488799ef7ab1ab0139311948358a31e0db40610c9155a9f31
font_01_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 10176 bytes
SHA-256: a24cd8402a87687c2b1ed333ca588567c155c1e8674479a9f9ea26ac060d914a

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