Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d34bf6a9e7e5a0…

MALICIOUS

PDF

81.1 KB Created: 2021-05-01 16:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5edd818dbbf561f00411aa020d36e107 SHA-1: 7d1b33b857016a3155ae1bf95de799a9e6680bcf SHA-256: b8d34bf6a9e7e5a015685b6bb7d8d75010aab19c7aed6bde01261d54242054fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary URL, fokemale.ru, is likely part of a phishing or spam campaign designed to drive traffic to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+is+cognitive+behavioural+therapy+used+for+depression PDF link annotation
    • http://rojoguladewex.iblogger.org/red_itchy_burning_spots_on_skin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_6032b7d9e7a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6013416a0ea46.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/vazefimojizulivox.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/libro_epidemiologia_basica_bonita.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/current_safety_topics_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5ff340a637baa.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/wuvapepor.pdfIn PDF document text
    • http://desokore.medianewsonline.com/aristofanes_biografia.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/2124306.pdfIn PDF document text
    • http://lozelenirulotu.22web.org/gabofipokalaxal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fomaralunex/xomukesiwulatax.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/ncert_class_9_civics_chapter_2_answers.pdfIn PDF document text
    • http://fezizovotovinul.rf.gd/how_to_write_a_conclusion_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/42185685171.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/5636798432.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/dulikemenudawiwamamipape.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/80352272629.pdfIn PDF document text
    • http://relabajegeb.rf.gd/74228976046.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/69863135382.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/large_numbers_worksheet_for_class_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 5652 bytes
SHA-256: ffd5866db8d8d19677b4772ca4de527c8e8902d681ea0ec3994855ae34885caf
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 11308 bytes
SHA-256: ff66de18d9d1232b25af5bb6979807b2d6f54266c1620372854d599169ead37b
font_02_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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