Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64f513ab895d6f4…

MALICIOUS

PDF

80.2 KB Created: 2021-05-31 21:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9629ddc8eba9abb56cf9812b38afd703 SHA-1: 4e5280dd26b3577adcfcf6d0e813d99917fcc3a5 SHA-256: c64f513ab895d6f4ec6ca914a75bf78cf52c19dd0d18d9716a1d5ed523fdac42
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://allytemp.ru/pbw?utm_term=pilot+battery+aptitude+test+sample+papers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5feea8a53c4eb.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/2578250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fe0530e6e9dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_602102d5d8962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_6050e93f3e11e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_60375c93a7853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5fcae727571ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_60568edb25b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_606563c1ca68e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456699/normal_5ff88d351f2e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_6058af04c4bba.pdfIn PDF document text
    • https://fudonorovivur.weebly.com/uploads/1/3/4/6/134665028/wixomabewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_600df7b9b9070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_606d264eb11cc.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/fdbebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fff14b4cb8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_604178ff45e39.pdfIn PDF document text
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/kikavekiv_tewoji_nimakedilobofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/f/84401964563.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144418452/dr_jagannath_dixit_diet_plan_in_marathi.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144421761/9396918819.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/rijisixowojatenorejime.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418647/google_drive_jurassic_world_fallen_kingdom_mp4.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/admiral_dryer_aed4675yq1_manual.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/algebraic_expressions_and_identities_class_8_worksheets_with_solutions.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/74332497289.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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 5348 bytes
SHA-256: 79462ef9d5531673cb9be8ad41f287c412b256cd0af5786844b7454e7e41cec9
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 10768 bytes
SHA-256: ffb6e7ec6aa184ad240c674515527d3afb4271f4ac433eb1d992def6fbb56014