Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2ec5343c84b655…

MALICIOUS

PDF

78.4 KB Created: 2021-05-21 05:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74c7afb8cfa5f2410e4cffdc452f6e5 SHA-1: 78fd92e8b941a7b4f3e925a28693b4701fc3c49b SHA-256: 3d2ec5343c84b655cf981a154fbd66ef4891f8c1a9081b22c2b1f5a637642d14
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to PDF files hosted on Weebly subdomains, suggesting a link farm or SEO manipulation tactic. The document's content is heavily obfuscated, but the presence of external URIs and a high ML score indicate malicious intent, likely to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=harry+potter+and+the+goblet+of+fire+trailer+addict
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/futegazoxedidabasex.pdf
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/4672807.pdf
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/jozuj.pdf
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/fugogolakonavuv_tawejomej.pdf
    • https://goxufosoxewuje.weebly.com/uploads/1/3/5/3/135300646/veromudolo.pdf
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/vibitakagolaji.pdf
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/zagupubizagusas-fobatinurewisav-mawak-doleniposufagaw.pdf
    • https://static.s123-cdn-static.com/uploads/4423195/normal_6006e3872e1e9.pdf
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5fd854f5c2427.pdf
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5fec05b8e0911.pdf
    • https://jokozoxusatolof.weebly.com/uploads/1/3/1/0/131070378/6807569.pdf
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/4a0bcf.pdf
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/rafasopewum_teriwegasibov.pdf
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/xidiwuzap.pdf
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/18095a11026085e.pdf
    • https://cdn-cms.f-static.net/uploads/4470222/normal_6033bf888d6fd.pdf
    • https://static.s123-cdn-static.com/uploads/4487206/normal_5fe246850b1cb.pdf
    • https://static.s123-cdn-static.com/uploads/4384304/normal_5fe1001120bfb.pdf
    • https://radojevujexoki.weebly.com/uploads/1/3/1/8/131871685/7896662.pdf
    • https://static.s123-cdn-static.com/uploads/4481422/normal_5ff07c8776119.pdf
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/wusuwomamofadeg.pdf
    • https://bazofaxeretaw.weebly.com/uploads/1/3/4/8/134868688/vusafarakowo-wadogatekat.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_606c1066bff7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14e.bin
fe249004cb93f664e16b869005a66e03f5e387276cfadfb1c9403633fbae6eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 5440 bytes
font_01_sfnt_off000103d5.bin
96e64681d124dab3a908623219dcc2de34cc3de5892a3b8229194c1afcdf61a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 11568 bytes

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