Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c11d277a45d62d6…

MALICIOUS

PDF

78.1 KB Created: 2021-02-21 01:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c225fc6f8cf33301bba09bb5ad6dce0e SHA-1: 1561e081101d1baa98b10466b07dcb90d5fbd0ce SHA-256: 5c11d277a45d62d63ce644ba11c50bad50b1294ef707547a24c2aac2774b124c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to direct users to potentially harmful content or phishing sites. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly implies an intent to exploit vulnerabilities or trick users into navigating to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=unblocked+tetris+echalk
    • https://cdn.sqhk.co/zubavagi/ZgjTjdr/evertech_sandbox_apk_revdl.pdf
    • https://cdn.sqhk.co/xesofosirija/5hjgcgj/doomsday_clicker_mod.pdf
    • https://cdn.sqhk.co/zejizoguzut/gj9Tjgg/39116701904.pdf
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/rojixatiluxilet.pdf
    • https://cdn.sqhk.co/wavagowew/bJqkiaS/skins_for_minecraft_download_free.pdf
    • https://cdn.sqhk.co/fupokonabat/9geiiBX/rufivivefijezok.pdf
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/622239.pdf
    • https://cdn.sqhk.co/lujobitazeku/lihujfg/95030651264.pdf
    • https://cdn.sqhk.co/dasewugiru/yahdsih/royal_caribbean_cruises_2020_from_southampton.pdf
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/6911412.pdf
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/ad8a0378c1.pdf
    • https://xutesinazered.weebly.com/uploads/1/3/4/5/134529246/5327888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rajamuviw.epizy.com/diabolik_lovers_more_blood_psp_game.pdf
    • http://mogopubu.epizy.com/lezamazizarizolirawuta.pdf
    • http://xuwuxubemepimox.rf.gd/tamil_hd_movies_with_english_subtitles.pdf
    • http://diwovofuzeloxu.epizy.com/13876660619.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c7.bin
7a3b07b690eab07fdc56c6bf957f28a1cb71e548bb65ce46b5a10aa0ef8707b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 5008 bytes
font_01_sfnt_off0000f1b3.bin
e490478290061e1556ff7e9b7fa4d8aa8f141613d1b52d8a3707695b7dd6dc4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 13320 bytes
font_02_sfnt_off00011c3a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 4324 bytes

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