Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29fb52280ecaab4…

MALICIOUS

PDF

89.9 KB Created: 2021-02-16 08:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 32c391aac90838bf3b752f5d55adf492 SHA-1: e7bcae051a2239cc7a6f6900b02a6ec65f23833b SHA-256: f29fb52280ecaab452b500bc7ac6b14a0ee6b94fb17260a1047f73f3b8b32bb8
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a malicious redirector, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the use of link farms on disposable hosting, suggesting an attempt to obscure the final destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+put+walking+foot+on+janome+sewing+machine In PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5fe3aeae3b973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600b338dd1e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_60209ed30105f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_5fd6c88406f42.pdfIn PDF document text
    • http://zegoves.22web.org/37059758724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392872/normal_5fcf4f1bc691d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fdff64b80d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fe770699ccd2.pdfIn PDF document text
    • http://tinivoze.22web.org/affinity_photo_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5ff1b1614c1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fe78c197d6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_601325577f883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_6004ead443ea2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_5fc6c97d3971c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_6020cf1369dce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fca0c7cae137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejezal.rf.gd/cardassian_uniform_colours_sto.pdfIn PDF document text
    • http://maligufaribez.epizy.com/borexubumeraxodagabufiko.pdfIn PDF document text
    • http://tamupevex.rf.gd/brother_in_arms_2_android.pdfIn PDF document text
    • http://tuzibepunu.rf.gd/dudanamimumanemutege.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_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 5528 bytes
SHA-256: 6bf17db2310e26f69b4d23839ee8103c4cec8fd66b905cb2538d4ee1efdf341a
font_01_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 10988 bytes
SHA-256: 95aa38f54d186f841479f55dd7df1bb9326f3d29fbffa4943df856a295e95b1f

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