Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2d427300df611f…

MALICIOUS

PDF

71.9 KB Created: 2021-02-19 05:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: df1a8b567879708ea01d86a87dac7aa7 SHA-1: e089f9c59e5ebabed4b96e4b617cdde94cf5a44e SHA-256: bc2d427300df611f7c0c36f6644b58948aa467f176daf46fbf54af6420d41ca4
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 PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to malicious sites.

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://bologen.ru/strik?utm_term=why+my+refrigerator+stop+cooling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5fd93e02937e8.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/5187697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6021c629701f1.pdfIn PDF document text
    • http://cabinetsly.xyz/91275406902kk6fg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_600f14ef53cc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_5ff5244437edd.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/2848651.pdfIn PDF document text
    • https://lisomoduxu.weebly.com/uploads/1/3/1/3/131383329/532634.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/geradi/firefox_60._4._0esr.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/d._e._m._s_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/asce_compaction_grouting_consensus_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/evine_clearance_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/live_circuit_board_wallpaper_android.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_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 5544 bytes
SHA-256: a8d71ea90947d5d3e8bedac4750c98c6650085ab346525b489326622cbccfcb6
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 11044 bytes
SHA-256: 374df9d2e237d3ab0ae1b0bd04463abdcc140d46b239e9b0b05e787464c9ec52

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