Malicious PDF — malware analysis report

Static analysis result for SHA-256 72939e43ff6aa6e6…

MALICIOUS

PDF

71.9 KB Created: 2021-06-10 15:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45bef6d3684e6a174b4d253f0b02c23d SHA-1: a8427b27a4a45ac5a9edcb414c7e07f3274126fa SHA-256: 72939e43ff6aa6e618a2ceed1fa0a6e9094564aa52b6c9bb4f4dee341684fc6f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=broken+glass+wallpaper+for+android PDF link annotation
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/demonup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_60581fd05c476.pdfIn PDF document text
    • https://wosexepipoto.weebly.com/uploads/1/3/5/3/135347387/vasuguguzuvel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_602885620a2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5ff79c65424f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384320/normal_5ffeabcfc6a61.pdfIn PDF document text
    • https://kavoxeta.weebly.com/uploads/1/3/5/3/135323229/17de2b313883bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_6036c4139a49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_604e4dcc7e060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_606c5c2a78d87.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/jigeli-rapodiremid-biruje-suvusavamufo.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/pazinilovepigejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_60639e9d50b59.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/66194053-4482-40a7-bfe4-ca5b63ecec8d/relion_blood_pressure_monitor_instructions.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144493542/miracle_frp_tool_thunder_edition_v1_02_cracked_2018_full_work.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144509601/biponib.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/f/65263424966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3bda2e-4b6e-4a6c-aa79-5572e287c88e/ruzekigojemejosu.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/how_to_prevent_trapezius_muscle.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144650610/15623499114.pdfIn PDF document text
    • http://radejaki.pbworks.com/w/file/fetch/144903630/quadratic_formula_axis_of_symmetry.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/suzuki_violin_book_3_piano_accompaniment_free.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/29935969019.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 5416 bytes
SHA-256: 06e105275cc01561adc206a77d7bac06d0f09d97524953080d476fb3c32529da
font_01_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 10396 bytes
SHA-256: 0ae6d868ed313ca1a5197a19e9bf10175fae311f3667a34e2aaf94a38f1a669a