Malicious PDF — malware analysis report

Static analysis result for SHA-256 18343ada695cdf6d…

MALICIOUS

PDF

84.7 KB Created: 2021-02-08 10:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1917e692e07771ec880f20f60f67c264 SHA-1: e997fcc816c1fb705418768a41d5f0b8fa45cfdc SHA-256: 18343ada695cdf6de3c41d41e838996193be212cd249332edbf5d249dfb6f32b
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 dynamically generated, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/aws?utm_term=appendages+of+the+skin+worksheet PDF link annotation
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/69e57030793.pdfIn PDF document text
    • http://labiosdewonda.com/14145532029iuoob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_600680a97f01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fda922adc391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_60128802d0f1c.pdfIn PDF document text
    • http://scriptbook.xyz/48354331411xcerv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_601ff860e4f8a.pdfIn PDF document text
    • http://my-favshopf.online/superman_comic_book_value32p0y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fcb2e038ed4d.pdfIn PDF document text
    • http://italia-doc.space/baby_panda_spiele_zum_runterladen9f9f8.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/8538b05404bb52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482405/normal_6000fc441e02e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_601cfb0b75b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fd14890418d7.pdfIn PDF document text
    • http://beach-fruit.fun/pisetuxa0lvn5.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/daraniwekamidir/eu4_brandenburg_guide_1._29.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/coursera_platform_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/87883911344.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/love_s_theme_barry_white_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/10168241829.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/61151690404.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/cadillacs_and_dinosaurs_mustapha_game_free.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_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 5416 bytes
SHA-256: 519bbe09d44de78797659c9086c355ca611fa8ec9ce9172605553c6ba368bf6e
font_01_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 13828 bytes
SHA-256: 8066b6304c2b2d6634d241d8571fb5c619b6b94e3e26fad8904aa79b54bcbae3

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