Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8f9eb13d270f4a…

MALICIOUS

PDF

65.7 KB Created: 2021-06-02 03:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7421db15ee1851f89543cadf9db92ff2 SHA-1: a43b3eb4cb5cf80ba0838865f8bdbe4da4ee8d46 SHA-256: 2d8f9eb13d270f4a02f4c25f5da42b173081ac32892d6eb91e436d381b557978
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting it functions as a link farm, potentially redirecting users to phishing sites or malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=adding+and+subtracting+fractions+worksheets+word+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386609/normal_603cfbd175503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_602597779d98f.pdfIn PDF document text
    • https://fowazukogapepeg.weebly.com/uploads/1/3/0/8/130873990/nolowexamuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_604e2b90cbfff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5ffc3a55e5a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_60479f7338e3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476429/normal_600770135e5cc.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/1063281.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/5945781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fe120a253bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5fe0801899025.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/latijibaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9e3694-5334-49a2-80ad-f134e48ca73b/stihl_chainsaw_ms_180_parts.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/83398839234.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/how_to_make_homopolar_motor_car.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/w/file/fetch/144484482/zumenu.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144480570/mawurukuvujokegodogipa.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144424794/44878405133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520f32e4-4024-4594-ab00-6b8bc809479a/98187211135.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/physics_for_scientists_and_engineers_6th_edition_tipler_solutions.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_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 5856 bytes
SHA-256: 69cda9f76478987023167017a2c5a94e6816880fade672f968bbf80c4e20f8f7
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 9372 bytes
SHA-256: c0197eac4f7d5cecac4c0884c799ca5d3518874cee3c8f8f756857c3d16fd0b3

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