Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca9da45cd06ce99…

MALICIOUS

PDF

78.4 KB Created: 2021-03-03 20:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf866f48a8f2af2a66c871455500f20 SHA-1: d04cc7df9980b327419b6d01bf719c4af34884fe SHA-256: 4ca9da45cd06ce99b0d4e65b64bba575cf87d2545f98dc7953021b35eb73d307
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable domains, and one prominent URL that appears to be part of a phishing lure related to 'fedloan contact fax number'. The presence of a link farm and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/123?utm_term=fedloan+contact+fax+number
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/kodabimuzop.pdf
    • http://ladyso.ru/pesakuwozanafowomifaro5699g.pdf
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/pasegabud.pdf
    • http://xuxetosufuzo.getenjoyment.net/2426480105.pdf
    • http://pimegaxonubaz.22web.org/51345719744.pdf
    • http://mybatut.store/458055914612fpzd.pdf
    • http://nuverlites.online/future_continuous_tense_worksheet_for_class_601pfr.pdf
    • http://myyshooop227.site/glencoe_physics_principles_and_problztme1.pdf
    • http://mnogolidov.xyz/miwobidesupa6dgvt.pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/7711277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fibonudonug.epizy.com/enzymatic_activity_lab_report.pdf
    • https://s3.amazonaws.com/kofabube/hyrule_warriors_definitive_edition_100_guide.pdf
    • http://lixutepojux.rf.gd/opera_browser_for_pc_64_bit.pdf
    • http://gitipezusev.rf.gd/battle_for_azeroth_soundtrack.pdf
    • http://vubedarav.epizy.com/kimeligidoxemikiramig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e956.bin
55a47b5356f48ef06848d24aea288cd5c672f55f850ff79bc0704eca96116776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 4984 bytes
font_01_sfnt_off0000fa34.bin
c65b783c472b1c1010253dc0c43819b7965af39a5294afb12a57179e0cf9cbc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10736 bytes
font_02_sfnt_off00011ec6.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 4324 bytes

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