Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fca90175c70e28b…

MALICIOUS

PDF

69.5 KB Created: 2021-02-14 22:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 158d215186c2e6c77ec8ae7b144af940 SHA-1: 90335b9c9d1420ec3fe173e2b2a40a1e66bb1f3e SHA-256: 8fca90175c70e28b3eec1aff33d892953e7fbbaea1ba98a7f09069ac2a712416
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, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to game-related terms and the wkhtmltopdf tool, which could be used to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=gunblood+unblocked+6969 PDF link annotation
    • http://itwow.info/warframe_clan_dojo_guideqtlji.pdfIn PDF document text
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/bafunodarugegal_ruwozi_lajatetidaji_sapezuwet.pdfIn PDF document text
    • http://muzoc.xyz/2869119104kv760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_6007681c43274.pdfIn PDF document text
    • http://bevojufonurol.iblogger.org/carroll_diagram_worksheets_ks2.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/a381c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fd06e20cd710.pdfIn PDF document text
    • https://sizemerekev.weebly.com/uploads/1/3/1/6/131606963/3bc2b83c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_601e093926eb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konapawejiwevin.epizy.com/avramis_river_indicator.pdfIn PDF document text
    • http://lopaxoreje.rf.gd/jufujoludif.pdfIn PDF document text
    • http://sujawusoxenum.rf.gd/71285458067.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 4992 bytes
SHA-256: 540082962e692a443800d2c0c24955f2ee8584db8991e38d7229617edad50d50
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 9948 bytes
SHA-256: 497f124cc41c2638d0c422dba51a9d39d548b831f90b6f71a21b33743d956d5f

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