Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0ec8fb7a026140…

MALICIOUS

PDF

69.3 KB Created: 2021-02-27 13:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d2c1f42e54d0e24db72025328ee76af SHA-1: d77111b8110760dcbc6910f54720d5e2227ac00d SHA-256: bf0ec8fb7a0261408c296ad0d832b27881a66d805fa176df5c588fbc52acf6a2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'fokemale.ru'. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', which is a common tactic for phishing and scam operations. The presence of many links on disposable hosting further supports a link farm or phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/wix?keyword=putting+it+all+together+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fd09de371ae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fedeb76eb10c.pdfIn PDF document text
    • http://helpcontactform.com/fur_elise_sheet_music_with_notes_labeledklv5w.pdfIn PDF document text
    • http://timelessdecorum.com/80992487733mo1eb.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/67609549052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6037d010101e6.pdfIn PDF document text
    • http://sokolov.fun/sisterhood_is_powerful_booknqyi8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452618/normal_60330a611a3ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_5fda72451fd27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_60375ddaeea50.pdfIn PDF document text
    • http://zarabatyivat.ru/viwizitx5k4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452374/normal_5ff80ad71772e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitulogakapede.myartsonline.com/96374740399.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/zogiv.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/how_to_connect_xpress_c460fw_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/fonimezojafemumesoxexuzit.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/22920444537.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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 5204 bytes
SHA-256: 88de2d5258d732875be58c4726c00a89a6eab5a22527f9ba60f34042ec812a11
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10104 bytes
SHA-256: 3ec04b2cf1edead9793fac1a84414082017ae42449d4e27ae0cd96d2a9bf0a9b

Open this report in the interactive analyzer, or submit your own file for analysis.