Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b399e8a526ced2…

MALICIOUS

PDF

78.1 KB Created: 2021-03-02 09:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f9bff10de61dd613d1ce7c0b61081232 SHA-1: 4a0a115c0e400976244584a8a123358d5b772313 SHA-256: 89b399e8a526ced27919631f6767834f813c485d9e929c0a702922444de3790c
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 point to PDF files hosted on dynamic domains, a common tactic for SEO link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=the+world+in+6+glasses+how+many+pages PDF link annotation
    • https://cdn.sqhk.co/letaziseb/higifgd/zirovapusamenesopixexobe.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/qjgBscn/35261824213.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/9248565.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/c2065e9d.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/Tl9hcjZ/zigulesekabokinasuxozavu.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/MgdkYii/digestive_biscuits_target_audience.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/ggUMfgi/dimoluwakawimodifolonal.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/fhbibff/20506608432.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/wenobagupexekap/pobenaxonasopadofu.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/spanishdict_formal_affirmative_and_negative_commands.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/2012_chevy_sonic_manual_transmission_fluid.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/54621993532.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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 5672 bytes
SHA-256: 4a3429247c036e975c7143872018d0973c638f4397825b8d5234e73235641d83
font_01_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10412 bytes
SHA-256: da50678ce4293665617816cbb91e038cd43b58b086fa20d5cb2e955c5dd0b97c

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