Malicious PDF — malware analysis report

Static analysis result for SHA-256 390fbddda8b46b9d…

MALICIOUS

PDF

81.5 KB Created: 2021-02-09 00:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9259f4cd2d3cc117a2739594fe6f6296 SHA-1: 78c6b34b721578f02420ece0f17cd5d2cfc3c9bf SHA-256: 390fbddda8b46b9df733636cd525b856d08ce08c1af67adec6206e6bf8767d59
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 pointing to Weebly and other free hosting services, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious 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://maypoin.ru/123?utm_term=negative+effects+of+british+imperialism+in+india PDF link annotation
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/pepeli.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/xieZie8/gaxovasunejowudif.pdfIn PDF document text
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/2701200.pdfIn PDF document text
    • http://kexipisibufexur.22web.org/zaveranololarodud.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/1ibJ6Zt/rocabella_santorini_wedding_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/jbgjjaR/sibesobofujakuda.pdfIn PDF document text
    • https://jutikuned.weebly.com/uploads/1/3/5/9/135966087/6189092.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/jcibjaT/forgot_lock_screen_passcode_ipad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393626/normal_6002e9ad51972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5fddb5318ec0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_5fdc249f760c8.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/jitosob.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/4996063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_5fe0bce617c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_601e00c70b14e.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/silubebebefuju/performance_appraisal_process_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/morningstar_direct.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/67751694824.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/xukanaputomerizetojiki.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/lotajamexadupedikakiwox.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/baby_birthday_status_song.pdfIn PDF document text
    • http://nadiripu.epizy.com/44839397283.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_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 5736 bytes
SHA-256: 9927f51daddf603403e96cf851f3abfedfd614b0df3373461e295c109fcc7b41
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 10392 bytes
SHA-256: 0c6521a82a27a09d9f63b1cb548c05925f8b30b539bbfbdf38b4814f55a9fe38

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