Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f6f079dddd52b8…

MALICIOUS

PDF

66.2 KB Created: 2020-12-16 02:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3766c17be7bd62e2bdbca146dc6f847 SHA-1: 161aef2974405a812a3a5344f51b7ec0db4efd9d SHA-256: 87f6f079dddd52b867b51b26a208d8f5bfeb351cc93282e2da31040019228933
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a domain associated with a tax calculator lure. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/123?utm_term=ct+state+tax+calculator+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5fb259316a3b0.pdfIn PDF document text
    • https://gazetitorujij.weebly.com/uploads/1/3/4/5/134599815/kagikinekixexogegepi.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/3229124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_5fd9331c16b1a.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/sosidipijo.pdfIn PDF document text
    • https://xokizaneg.weebly.com/uploads/1/3/4/8/134886830/2ef0ee35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbffe9d5687f52b6b7c161f/t/5fc818bd7ff5a343ebe745d4/1606949054660/melody_and_martell_holt_net_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/61539920581.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67aea084698658e84b086/t/5fd1f45b87bef85997f250c8/1607595099648/90655353083.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/81837404857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df8972c-01a3-4209-a44c-67a7a45e333c/sifidonarewijal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b23150-716c-454f-b22a-b339073824b8/transgenicos_ventajas_y_desventajas.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/employment_history_verification_template.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_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 5040 bytes
SHA-256: f50f32477a50bdb32836398fce67509b07c1341378bc3aec5f5bec15a25cf39b
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10812 bytes
SHA-256: 45c53d3da6d43cfec44ad2131bd1b55982f6d5d1d14b0dd294f553630623f3a5

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