Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a149e2a2215a1d…

MALICIOUS

PDF

78.0 KB Created: 2021-06-09 11:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 20c34aaaeedd29a3af650dd5095b05da SHA-1: 0d374b0b249a839f8f8c29bcc440ea25e491dd97 SHA-256: 25a149e2a2215a1dd8c3f2e5df61fa9327e5081b28031c0a4bf76ca0ee8885d8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL suggesting a lure for game hacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites or download further payloads.

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://ketchas.ru/pbw?utm_term=mini+militia+2+hack+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490251/normal_600be760abcac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_604ca5f56f7a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ffed41a4677a.pdfIn PDF document text
    • https://janewabogub.weebly.com/uploads/1/3/4/4/134483822/61dd8aed7.pdfIn PDF document text
    • https://zisirusezudi.weebly.com/uploads/1/3/4/8/134846547/buxeririda.pdfIn PDF document text
    • https://teroradibiz.weebly.com/uploads/1/3/4/6/134652159/jukexafikasepupamaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5ff19d44e2393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_605ee7f2e4a21.pdfIn PDF document text
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/kegajiguledezavawova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_600a091e1240f.pdfIn PDF document text
    • https://pitinolulisam.weebly.com/uploads/1/3/1/3/131381612/847649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_602b90441d60e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_6056389201381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5fcf0bc8399b3.pdfIn PDF document text
    • https://vivimojegoduv.weebly.com/uploads/1/3/4/8/134890214/zuraxoki.pdfIn PDF document text
    • https://vafumuwolefuz.weebly.com/uploads/1/3/5/3/135325426/nusowutozage-kaxama-rupifuxiti-miwedowadazav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5fe621eb01129.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/f7b864b1.pdfIn PDF document text
    • https://xoluvujotu.weebly.com/uploads/1/3/1/0/131070376/sanunijuxivowikaja.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/c7f75020-baa4-4207-a632-3124b1fe4896/delta_band_saw_28-180_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c084065-d6fc-4bef-9313-ce23feaafd19/75193439758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1f4fad-014c-4035-9632-133b96b80fe5/what_are_the_duties_and_responsibilities_of_procurement_officer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b01f49-8298-4729-89c2-b104334c1852/is_casio_fx_82au_plus_a_programmable_calculator.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_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 5300 bytes
SHA-256: eeb88d5efa4e11352a7a46295a72a0dd54db6a0f3d539e051850e89db8e855d5
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10632 bytes
SHA-256: 075f2130b631698565d78facfadb8cfdcf4bd330a3964dbbc9764876a42651d4