Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61df8ccbbf280eb…

MALICIOUS

PDF

100.2 KB Created: 2021-01-22 16:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 24791679ddb15f2f475883f9d7bcf84c SHA-1: ec4335e437bf739b186bfb15d5893dd272b8f3f2 SHA-256: a61df8ccbbf280eb3cfc26289750a059c9bf0d2dce3e8fb53981c0817919f5cb
126 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy, likely to obscure the true destination or to spread traffic across multiple compromised or malicious sites.

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://traffset.ru/123?utm_term=tv+guide+listings+mesquite+nv PDF link annotation
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/pajojumojejonutufupo.pdfIn PDF document text
    • https://xisotufonadate.weebly.com/uploads/1/3/5/3/135384012/5462587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fc7f0323136b.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/vaxiwatubesutu_govir_pitigevefuruz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5fff9d0c771a1.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/geferi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_600a2813473f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fcdaa1490d84.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/7840816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ff29227b185d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidawuz.epizy.com/appvalley_spotify_won_t.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/kimonexamogodab.pdfIn PDF document text
    • http://fumojaw.epizy.com/material_safety_data_sheet_calcium_hypochlorite.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/duwamish_river_fishing_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/dubik.pdfIn PDF document text
    • http://tosivasode.epizy.com/samsung_a8000_firmware.pdfIn PDF document text
    • http://kupavojos.epizy.com/fogasomusofor.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/bulbous_crawler_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/xujalu.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_off00014727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14727 4972 bytes
SHA-256: f31dddfe35c4010b2691c0dbc88e2e96b3865b8f9e5eae8b091c65ee8c8e5eaa
font_01_sfnt_off00015804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15804 13132 bytes
SHA-256: 6e6320a84de2d08ac686492404046d1dffbdb788de53bfb1f03eb250ad19d0a0

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