Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75d046e8ef36eb1…

MALICIOUS

PDF

101.5 KB Created: 2021-03-30 06:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 67fa9db69f77b2e1906efaeaee51bdf0 SHA-1: 2be14156ef9872d81eac37fc56f04521a97f80f7 SHA-256: a75d046e8ef36eb1edd06e404ea35d2ddb1d5d42fcfc83cce42d621a8c4325ad
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a link farm. The ML classifier and ClamAV both strongly indicate maliciousness. The presence of external URIs and the link farm structure suggest the document is designed to redirect users to potentially malicious websites, possibly for phishing or SEO spam. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=how+to+install+mr+heater+maxx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471959/normal_603685ac3a133.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hjjjhcH/debudewidixunoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_6015470f5de16.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/vZZMSia/18190884028.pdfIn PDF document text
    • https://cdn.sqhk.co/nagotumubo/ohcLhe1/retelusiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/i1JJjc5/82274130720.pdfIn PDF document text
    • https://cdn.sqhk.co/nedevupoj/jIavTSp/76898858226.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/jg2Kfur/36370782881.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/TU7Eicx/letter_before_action_template_builder.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ZifuKis/nafugokaguji.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/biblical_timeline_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_60600c06ae167.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/jhkfjdK/89508460947.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/kuxedifikub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499005/normal_5fda4272e7b36.pdfIn PDF document text
    • https://cdn.sqhk.co/tapowifilez/hjcpt7z/19405759844.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_695610284b7847b6b246ea8609568f7b.pdf?index=trueIn PDF document text
    • http://sajipesexadagon.epizy.com/bonafide_letter_format_for_school.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/past_perfect_simple_and_continuous_worksheets.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_cd852f2aa924443abac529d7e44add31.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/rinuxarubuloxokiki.pdfIn PDF document text
    • http://timavutiziv.epizy.com/cetoacidosis_diabetica_ada.pdfIn PDF document text
    • http://sidijujaz.epizy.com/32845317698.pdfIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_73d34a4417af49349f2fd3fee884937c.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_4a7d71fb1b9b4f09b6cc44a75afef9b0.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/lawometufowa.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_off00014ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD0 5048 bytes
SHA-256: c2442b94fbb859614d8e6a9110b20501a46032fdc4af312304d34aac9326344a
font_01_sfnt_off00015bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD9 12592 bytes
SHA-256: 79db986f63e4ed1296bd6281b1acdd8d3e5b32674221f70b68410824d1e52637