Malicious PDF — malware analysis report

Static analysis result for SHA-256 d827ec7b9a9f1195…

MALICIOUS

PDF

85.1 KB Created: 2021-03-17 23:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 600d16948cd8d1b83f56397a13c78f04 SHA-1: 25a388441a53c752e143f2922f7cbfd6c9ad8f39 SHA-256: d827ec7b9a9f1195d79ae02284fea8b84ccd231b65131f13f3c9fee74abd9cd4
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/award?keyword=frankenstein+oxford+bookworms+stage+3+pdf PDF link annotation
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/vazabopowoganazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_5ffe957cbda95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_602aea7333ba6.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/469261.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/sabugipizif-wamavubi-mabiroweb.pdfIn PDF document text
    • https://vawemuziz.weebly.com/uploads/1/3/5/3/135351027/fixuxelepupujekewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6022bac02dfd9.pdfIn PDF document text
    • https://risixugetiso.weebly.com/uploads/1/3/5/3/135317557/voreluwekewasasawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_603d2fc5eba39.pdfIn PDF document text
    • https://danupinizagene.weebly.com/uploads/1/3/1/4/131483344/renetorabazizoniz.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/c43b8f0.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/6678602.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/pirozeje-zigexisi.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/fovateta-fozokomoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6014c7832d179.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuwudepebepusab.rf.gd/strength_training_anatomy_3.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_6d96ac15d9a2470daddc1bf3b2d4c72b.pdf?index=trueIn PDF document text
    • http://tixujuw.rf.gd/challenging_quiz_questions_and_answers.pdfIn PDF document text
    • http://kitavaxizajemo.epizy.com/xaremivaniji.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_aa225ef3a1574def8e7726156906593f.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 6608 bytes
SHA-256: 6f3f8c1adadb1d911da2e67525c0c20af3ee4e93b65d4a5a43d45208e294a0e9
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 5812 bytes
SHA-256: 02f0c4dce057ecd8db4c2567a665d9946e8e8bdf27f42f6fc2123aa4a0504323
font_02_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 12232 bytes
SHA-256: c82942fd0f688a9af0d56759fc01be65680ea9b238b3cc441ac8e42c0081fc05
font_03_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 16220 bytes
SHA-256: 190fe1ee671a692b21adcb8eec05e87b108b6528b1ec362376566d2fcf3b4c37