Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db0752c13abe3ff…

MALICIOUS

PDF

74.3 KB Created: 2021-02-26 08:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e20d26701507b7573d1c36713419afa0 SHA-1: d1a7023890cdc75de7b85b70fcd856ec648f80f4 SHA-256: 9db0752c13abe3ffecc704f3fc00a0e54f66adb14a3dea999e434f7c2786bfb5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure or disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Is a song of fire and ice finished' and 'wkhtmltopdf', which may be part of a lure or camouflage.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=is+a+song+of+fire+and+ice+finished In PDF document text
    • http://iminn.ru/bumasitelofe2d5x6.pdfIn PDF document text
    • https://zefivevolexu.weebly.com/uploads/1/3/1/6/131637056/rarodaso.pdfIn PDF document text
    • http://yoga-italy.space/orion_cooker_home_depotal5zk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5fecb1841a8d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_601a6c89b1b07.pdfIn PDF document text
    • http://covid-19online.site/43586721186chxby.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/zaxijaladisube-xotizerimo.pdfIn PDF document text
    • https://sabigojepesadiz.weebly.com/uploads/1/3/2/8/132814096/kixakukedopimid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_60340ea6bed52.pdfIn PDF document text
    • http://goldstein.berlin/lizesijagesibamagopikokmqw1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/disable_default_calendar_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/video_er_professional_for_edge.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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 3488 bytes
SHA-256: 4f41634859431d2a30b3bac735d338f4a5128e161686d69135f3255a50f3becd
font_01_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5188 bytes
SHA-256: 680848c8e73a46eaec51ff27a80b0d6d2b3807f1151361ca02812e2bcc83346f
font_02_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 11448 bytes
SHA-256: a5bbcc3dd9204347224accfdf58425e4fb88198f379a10d7467a825d01244423

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