Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d57de008de6d4a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 22:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0a896a48e3ba5bc90da7f815e725827 SHA-1: b887ac508e83c70e83dd69f0cb1e220835b1a69b SHA-256: f8d57de008de6d4a72d5de1616bf4b13eb3650902e3617c6104188629e9dca93
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wix?keyword=life+without+go+go+boots+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467601/normal_603c19ab030ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5ff56dba2b74b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_6027dd3fbba0e.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/nexofiwebulumo-gaxanunowoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/hDhjlEu/vega_conflict_player_stats.pdfIn PDF document text
    • https://rafanubenab.weebly.com/uploads/1/3/4/7/134747024/gamofap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fc9d87dae6eb.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/1149e1eb269.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/8694208.pdfIn PDF document text
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/funemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_6014b93a658c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_604671650de29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370303/normal_60002f88917fb.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/Xd4UWij/costumes_with_masks_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_6019bc22439cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_6033a84475003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_e4bef42d00aa4af2842307053df3b0d6.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_83e392e8ba924861a133b9d4f9b6a505.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_8fee84d3113f4dca997f9252058e6549.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_afcbbb86e1ac46e789cded9605b9bdea.pdf?index=trueIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_e2df48d3acdf4a18a593e865669359d4.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_f91d2effc0fb453583777231f3e4e1df.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_591f1bc8a94e4355bd38a7a27435e97d.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_047b0038da3d4d3e822a2d74d6fd5218.pdf?index=trueIn 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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 5140 bytes
SHA-256: d3b7378cdf0d8c4cd4e6bff558933237942769de6254ef22d420c3204cc86cde
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10756 bytes
SHA-256: 79f73afa477114411024ca02db9466f872fcdeed9ef4d5c57c6efdd0d99aa6f1