Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce0125e734182cc…

MALICIOUS

PDF

70.6 KB Created: 2021-01-29 08:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b344e42f440d699b9e7a679a43df5da2 SHA-1: 1a4e9bfb97b655e121b87b0fb2a4c3c6036e7faa SHA-256: dce0125e734182ccc4783e6babad94efb6c80bd5409c434f72da9256745a4115
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to 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://leonvi.ru/123?utm_term=one+letter+amino+acid+code PDF link annotation
    • http://ximikilanad.22web.org/army_officer_evaluation_report_form.pdfIn PDF document text
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/15cce8fe6227f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5ff9e6154d4dc.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/jdjeqhc/spiritual_awakening_movies.pdfIn PDF document text
    • http://kekebum.22web.org/lezedeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_60006eb2bb808.pdfIn PDF document text
    • http://letekidela.iblogger.org/97822416461.pdfIn PDF document text
    • https://mavoxigomag.weebly.com/uploads/1/3/4/0/134096713/8839475.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/diifZjg/bubble_witch_saga_3_mod_apk_unlimited_boosters.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/ba7jfgg/gosofugutumi.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/ahchddC/brick_breaker_arcade_online.pdfIn PDF document text
    • http://vejobazure.22web.org/487050829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_600a9aed2d76e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safasufozoz.rf.gd/biogeography_evolution.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/14753206691.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/wudesokaxirusulebawu.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/critical_thinking_detective_book_1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 4936 bytes
SHA-256: a615fae0e21d05aa758185d6cdefb209bea5aa310f3f3ed0297dfd0a0f24b441
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 10800 bytes
SHA-256: 2068cc6c6a6b875429ef6b3eb4888d1dbb0e676ed5412ff15b3090278f340148

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