Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c36974f4efece47…

MALICIOUS

PDF

97.8 KB Created: 2021-01-20 00:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d60acd4add070f92bee2e6c8d005ab7b SHA-1: b531b91aacb987fb41ba958a24a6cc381581da7b SHA-256: 4c36974f4efece475f4042ad39d5e13daf8858576744eb1739f21efb85b423fc
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, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing phishing content or malware.

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://trafffe.ru/123?utm_term=thinking+cap+wizard101 PDF link annotation
    • https://site-1176112.mozfiles.com/files/1176112/pokirekufusevazis.pdfIn PDF document text
    • https://site-1181110.mozfiles.com/files/1181110/bingo_battleford_mississauga.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/2W1yjXL/skins_among_us_free_version_2020_latest.pdfIn PDF document text
    • https://lizekolu.weebly.com/uploads/1/3/1/3/131379949/d975b32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fb5dc2d88d1b.pdfIn PDF document text
    • http://dazenad.iblogger.org/25063919109.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/jhjanEj/maribazikaxoje.pdfIn PDF document text
    • https://site-1230736.mozfiles.com/files/1230736/13843400251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fae135d4e2cc.pdfIn PDF document text
    • https://site-1176433.mozfiles.com/files/1176433/3798564319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff25d0992d7c.pdfIn PDF document text
    • https://site-1234895.mozfiles.com/files/1234895/numerical_integration_excel_spreadsheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_5fa67fd8e686b.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/d1837cfc8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nupuzasig.epizy.com/21806021203.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 4952 bytes
SHA-256: cb93bbb59117df5f0eea8924fed1097add37d528f8585baae004beb38ab733ce
font_01_sfnt_off000143c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C8 11904 bytes
SHA-256: 14dc1715cbff15658e065e46c6906f1dbb59ead0b63f8dd9868f8fea18cfc43f
font_02_sfnt_off00016c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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