Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e116f51e76a5a6…

MALICIOUS

PDF

82.2 KB Created: 2021-02-27 21:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1e41b066bd6c02ee1b5385047c6fe59 SHA-1: 7bbe1e56ed87fafcfc2127e1b3303c51eb28283d SHA-256: 13e116f51e76a5a6bcc554c12ca0f37077adfdcc72a931917a485eef84e3e072
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', suggesting it was generated programmatically to appear as a system information document, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=tipos+de+sistemas+operativos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd247066d4fb.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/google_forms_quiz_time_limitwsges.pdfIn PDF document text
    • https://wabavavopip.weebly.com/uploads/1/3/4/3/134317653/mazutepepalozo.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/pekatenodo.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/tiruzubufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fdefc1d902c7.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/degipenononono.pdfIn PDF document text
    • http://xaduwufuwa.22web.org/man_of_constant_sorrow_banjo_chords_and_lyrics.pdfIn PDF document text
    • http://osmosiotzs.fun/ambulance_driver_handbook_californiaqufza.pdfIn PDF document text
    • http://tederurokeroga.iblogger.org/kusozufidugubatezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fe76b444f401.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/wixenek-dudegoliwa.pdfIn PDF document text
    • http://teksalle.xyz/lopufomedezavd15f6.pdfIn PDF document text
    • http://mpvideo.org/fast_racing_league_dolphinn73s1.pdfIn PDF document text
    • http://lulumel.66ghz.com/bumisiberesowokugekew.pdfIn PDF document text
    • http://itdiscounts.pro/95979679584p5qxv.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/zekex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xozelabudizi.epizy.com/79145249165.pdfIn PDF document text
    • http://rigeladujonij.epizy.com/bostan_saadi.pdfIn PDF document text
    • http://malinaliwul.epizy.com/daraz_apk_file.pdfIn PDF document text
    • http://taluzeze.rf.gd/4152746632.pdfIn PDF document text
    • http://gusepegap.rf.gd/12338700255.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_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 5080 bytes
SHA-256: 3c7c41b030a739162f6bb3cb464ab5ac02eb8208c5bc428f423a4d7db0042825
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 12100 bytes
SHA-256: acd728bd4403135fa8724e52ba3b58c8cfc932e238f8f878b4ddd72d377efa29

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