Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b67b581fd758d63…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 04:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4819ccca7fb01021e64fe600fce3c09b SHA-1: 2cfd1029f51ae7e26feaa9e10f13d64ebdfcf0d4 SHA-256: 9b67b581fd758d630394646c39a31c44c1ca27d138a6332ce5157cf070915c9f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to thermostat usage, designed to trick users into visiting these 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://druttle.ru/123?utm_term=how+to+use+a+non+programmable+thermostat PDF link annotation
    • https://cdn.sqhk.co/rebiguta/dLx98ic/86501705121.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/c65b03a0.pdfIn PDF document text
    • http://theraisins.pro/how_to_troubleshoot_air_conditioner_not_turning_on6m5f9.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/QnfCChi/16686973033.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/119368.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hohgZ1v/26309409772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujukiji.rf.gd/joomla_2._5_template_responsive_free.pdfIn PDF document text
    • http://gixopesibesuges.epizy.com/thyroid_cancer_pregnancy_guidelines.pdfIn PDF document text
    • http://temekem.epizy.com/dough_sheeter_for_sale.pdfIn PDF document text
    • http://jomolupumiroj.rf.gd/how_to_identify_your_pimples_off.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/john_deere_48_mower_deck_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/68696573662.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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 5428 bytes
SHA-256: ea2770317169f11805689b4482791e16a58f62607d6875add633ce58145e8793
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 11072 bytes
SHA-256: c18e2b7289f19b0869b2f5cd14c7a49254fc3a4ea85ba1a8923fa8ea03278804

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