Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fda5ce014f9c1c…

MALICIOUS

PDF

95.9 KB Created: 2021-06-07 04:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 48d50e3dfa0ca1cf0ec506b93823bc65 SHA-1: 0425318cf4ce51d09aac2e0c17a3e4fded616482 SHA-256: 91fda5ce014f9c1c7de9e3858eee5dd9ef04dcf237cd2894c854e7fedc619a1d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/pbw?utm_term=brian+froud+faeries+oracle+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401697/normal_6006e18b341cc.pdfIn PDF document text
    • https://wezuzaxularo.weebly.com/uploads/1/3/1/4/131406207/1672885.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/8744339e8ae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5fca1217487bf.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/tosabunizumeti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_60539b0486366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe8c0fa620c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_606e374f94a99.pdfIn PDF document text
    • https://pukewuvidepuf.weebly.com/uploads/1/3/4/3/134321324/2275527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_6027948091b6f.pdfIn PDF document text
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/9886604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_601e035c43492.pdfIn PDF document text
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/247d648123e53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcf60ce2b9ae.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/2e1f533403f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_6024aa0f14fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_601a62cb3823e.pdfIn PDF document text
    • https://neseriduro.weebly.com/uploads/1/3/4/8/134851425/gekijidawidemus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144466905/briggs_and_stratton_snow_blower_auger_parts.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/f/at_what_coordinates_do_you_find_diamonds_in_minecraft.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 5000 bytes
SHA-256: 65aae2038a209bc7879270b3c055937b1312a6fa9c07327034f0ffaae9564815
font_01_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 11332 bytes
SHA-256: f4b91ad7f4ed4218f548f401c0090d3e59145b0ddaf407645dfe7c1956a4acdc
font_02_sfnt_off0001622e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c