Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fb2cf338950992…

MALICIOUS

PDF

76.0 KB Created: 2021-06-06 06:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 422c49f46a28a9cc689a0f0b4bf5f216 SHA-1: c0a97737f615d3c210234a81aa2b721474f2d83f SHA-256: b2fb2cf338950992eac8a6940b3d49a7e2ef1c5263d5a7efe29007721bbb64ec
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL points to 'crewmak.ru', which is likely used to redirect users to malicious content or collect credentials. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=midmark+m9+cleaning+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416327/normal_602115ac1c180.pdfIn PDF document text
    • https://xosizinunebazen.weebly.com/uploads/1/3/4/0/134017923/0261b0d090.pdfIn PDF document text
    • https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/xulomasuj.pdfIn PDF document text
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/nabusoneju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_606562c03ad8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_6066a40f962c0.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/mopepefavote.pdfIn PDF document text
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/gunajogedumetut-nezagir-tibirodufiboli.pdfIn PDF document text
    • https://fanonobumoxevo.weebly.com/uploads/1/3/1/3/131384335/218047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_6060d452804e7.pdfIn PDF document text
    • https://tesokumerapaj.weebly.com/uploads/1/3/4/5/134522001/b5e6f0e3beb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fec9cb762648.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/nifili_labofemixawezix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_603123c65779b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5ff1cb2e4ff8c.pdfIn PDF document text
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/zimefuxafenop-kelepiluvorobo-posirodow-vewevuluv.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
    • https://uploads.strikinglycdn.com/files/d6f9181d-42e6-4b29-8372-73aac2401c19/46760273754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14abe69d-eb51-4086-a142-d548b9c6abd5/printable_grid_paper_a4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1e0bcf-eec1-48f1-abee-cb4c88894054/tp-link_tc-7610_docsis_3.0_cable_modem_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326ea27f-dce0-45d0-9b3f-6903325ce2ab/how_to_properly_install_air_admittance_valve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5eb876-87d3-4936-b9ed-a09fe96657da/razowizonolaw.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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 5364 bytes
SHA-256: d0bcdb4054e1b39f18093b89e1b3bbffdb36cb9fda666f42ba3d7046639e4916
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 11252 bytes
SHA-256: 45eac9cf42442c61dfdb79221996d67e4f7a334b12157d3ca51c20af7657061c
font_02_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378