Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d86450852e2056d…

MALICIOUS

PDF

65.8 KB Created: 2021-02-20 07:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 25b52b3869717368ec1ae93f901d0d90 SHA-1: 182d3d1b58aa4f05848b256e7eec5815e07b9879 SHA-256: 0d86450852e2056d316a191aa7eb0d4b2ef2dc8cb258f2983b0eeb76be796265
126 Risk Score

Malware Insights

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

The sample is a PDF file 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, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no direct user-facing text that would indicate a specific 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://druttle.ru/wix?keyword=aps+edu+blackboard PDF link annotation
    • http://wavoxibex.iblogger.org/komapixedugewidawego.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/ibigjgm/27080349157.pdfIn PDF document text
    • https://cdn.sqhk.co/fezemepusap/diaTfij/crown_princess_cruise_ship_news.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405194/normal_5fcf03e880f23.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/jJiaslu/storyline_online_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/vazodowadu/hdoYhjj/wubajuxolamusenuxulif.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/Ijcq1z3/train_simulator_games.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/jCihqfq/sports_tv_live_app_for_pc.pdfIn PDF document text
    • http://xigesoti.iblogger.org/22288617548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fd93fbd2a007.pdfIn PDF document text
    • http://mefuban.iblogger.org/muvidofi.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/QhgiJjh/orange_candy_slices_and_other_secret_tales.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/jibjehd/34519207835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_600ce9e3c6780.pdfIn PDF document text
    • http://gifozuxozud.22web.org/vozedegiporebutuvuvam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5fd6f515d2b64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafexepov.epizy.com/52341406121.pdfIn PDF document text
    • http://vaxasevon.epizy.com/gujisezugiwaxefusoge.pdfIn PDF document text
    • http://pinopog.rf.gd/wapulokizuvorutaroxanizi.pdfIn PDF document text
    • http://xaterukojokose.rf.gd/handloom_bedsheets_wholesaler.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_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 5260 bytes
SHA-256: 55a10fa989672faef8b54fe3c3b45e8fc60fb381b1c48e26c957d4ad58df53d8
font_01_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 9972 bytes
SHA-256: 6eb6b4088162350368f6d49b39d364e44cfba71fdd3d2cb6f1b482ba182539c8

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