Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfb2491ac7a4eb2…

MALICIOUS

PDF

72.3 KB Created: 2021-01-24 03:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6cb74b9746b46becf0cf825631e29429 SHA-1: 734d878a18556cb5376f542e27f99c13d1f30e69 SHA-256: edfb2491ac7a4eb2a2b0094baa984298cf524ecb382a8343bf1b2dcf743d508f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is part of a link farm and is flagged as malicious by ML classifiers and ClamAV. The embedded URL `https://seumenha.ru/123?utm_term=heat+online+application+utah` suggests a phishing or malware distribution attempt, disguised as an application. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=heat+online+application+utah PDF link annotation
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/4cce8a6ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_5fd159b3cbf5e.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/vedolok_vudatajewo_nefiwusi_sarutiberaniv.pdfIn PDF document text
    • https://site-1168337.mozfiles.com/files/1168337/kinijifawezunabunate.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/sejavita.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/2571922.pdfIn PDF document text
    • https://site-1178845.mozfiles.com/files/1178845/enlightenment_now_audiobook.pdfIn PDF document text
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/xibav_mezumufugede_nulefewu.pdfIn PDF document text
    • https://site-1196614.mozfiles.com/files/1196614/72461266738.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/30090c046f0d662.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/ef8c275e74c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd1920a9d196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd64833628a5.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/zupenafud/accompanies_the_livestock_industry_student_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/vimivowatoxetuxalituson.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/fuwuxutifegivarumig.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/convert_xapk_to_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/7550896080.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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 4708 bytes
SHA-256: 9f79f9e4d1abbe39b8cddcf90ddba429772bf64d86a8be17c15ee37a0a337116
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10976 bytes
SHA-256: e3172c91665245b52a063fadbe2ce7cf665abc8e81cad2af535d61008f665ce5

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