Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c9585c46f6a912…

MALICIOUS

PDF

71.9 KB Created: 2021-01-16 08:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 65558d8ea167a732194fd25ee26c841e SHA-1: 34b40f41589fe8376e67f9cfc5239c07acc66f2d SHA-256: 13c9585c46f6a912a1ea658aa1752618856f63fef1bb2f4bb07843e8ad299c76
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to various potentially malicious websites. The document body contains metadata related to its creation, but no explicit user-facing content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=acura+integra+manual+transmission+fluid+capacity PDF link annotation
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/dililogudiriribefoza.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/lolobojexuk-mewuki.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/6666545.pdfIn PDF document text
    • https://site-1168485.mozfiles.com/files/1168485/hungry_shark_world_hack_ios_no_human_verification.pdfIn PDF document text
    • https://site-1167941.mozfiles.com/files/1167941/covid_positive_test_result_email.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/R7NAicd/real_car_drift_simulator_download.pdfIn PDF document text
    • https://site-1175333.mozfiles.com/files/1175333/best_samsung_android_mobiles_under_10000.pdfIn PDF document text
    • https://cdn.sqhk.co/gobopovupav/gcWpZii/queen_greatest_hits_vinyl_ebay.pdfIn PDF document text
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/fusodawugijiromon.pdfIn PDF document text
    • https://xorozatu.weebly.com/uploads/1/3/4/4/134461248/7009266.pdfIn PDF document text
    • https://rosivitowa.weebly.com/uploads/1/3/4/5/134590356/topijuroburamat_tuvetuzoxofunij_tarodivofusisit.pdfIn PDF document text
    • https://site-1195189.mozfiles.com/files/1195189/blood_pressure_targets_hypertension_guidelines.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/9414771.pdfIn PDF document text
    • https://site-1174819.mozfiles.com/files/1174819/wuzasekivozazek.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/bulagunakagaganomamagutid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5564 bytes
SHA-256: 8e29472ccca08ad40d966742a19769273100d8a319562aaaf1147460a7f61e6c
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 9912 bytes
SHA-256: 76e4ded6d26fc14ac73f609537167c5cb418fc9a7a0bf0ab456c4dac40148167

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