Malicious PDF — malware analysis report

Static analysis result for SHA-256 276519dfe11dbac8…

MALICIOUS

PDF

117.2 KB Created: 2021-02-28 00:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2c55aebbae6de934879db957fd0193a2 SHA-1: 265f24eb818a03c123dfeb2387bf37529ece8fdf SHA-256: 276519dfe11dbac8b0dc8b9246ecc2c6484bff95a52f23228dad6e9c8888cf60
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 payload. It contains numerous embedded URLs, many of which point to disposable domains and link farms, suggesting a tactic to obscure the final malicious destination. The document body, though heavily obfuscated, contains keywords related to a wiring diagram, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/aws?utm_term=pioneer+avh-x3600bhs+wiring+harness+diagram PDF link annotation
    • http://mosebuzixat.mywebcommunity.org/nugunobaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fe87e80dbe4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385424/normal_6008cbe22da1f.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/wpkjfhe/nuxodowumokuk.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/aggcWif/hair_color_changing_app_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/ii5zJia/condos_for_sale_in_bay_harbor_islands_florida.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/xazovugotufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_603828534883b.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/fhdgigf/x_core_sprinkler_system_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/musarawaw/jigC5hj/makowinujipiw.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/does_the_lexus_hybrid_require_premium_gas.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/xijajafaneduwarudezusowa.pdfIn PDF document text
    • http://aov.one/rubufidevagaw6ppd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liraperuwuw.atwebpages.com/podusubuxumozow.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_off00018c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C09 6060 bytes
SHA-256: 7a18503813608453fb3e9f64023b44471d48d8d4268e6b54ec4385c712144b7c
font_01_sfnt_off0001a096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A096 11432 bytes
SHA-256: 1b620aeaca0499a4a9b94aeb795f997fddc88b50e062de3c6b1840e9b46c2f4e

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