Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b1dbce2b0ffdc4…

MALICIOUS

PDF

78.9 KB Created: 2021-02-17 11:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d58b0f3643cee36745ebc1ada097b25e SHA-1: efc61a87a3f27ddc3661f7f04088d5567a67e82e SHA-256: 42b1dbce2b0ffdc4e2578e17e5c31256505337f02efdb5ca7393f45ecc78197b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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/strik?utm_term=automation+production+systems+and+computer+integrated+manufacturing+solution+manual+free PDF link annotation
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/9400280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_602ca29bec7af.pdfIn PDF document text
    • http://gajozemexip.22web.org/what_is_a_sen_assessment.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/8daf16fe990ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5fef9c0fbe5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_5fd97442e1923.pdfIn PDF document text
    • http://vekvelo.ru/poe_do_spells_hitk9n5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zolorame.rf.gd/apna_time_aayega_song_pagalworld_com.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/fosesuwala.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/annexure_d_of_indian_passport_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/wexolabemilixem.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/avatar_2009_lk21.pdfIn PDF document text
    • http://sokevigaku.rf.gd/bomb_squad_money_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/facebook_videos_online_mobile.pdfIn PDF document text
    • http://xitirinajeki.epizy.com/88813717521.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/android_emulator_win_7.pdfIn PDF document text
    • http://jifazuniduvosi.epizy.com/deesa_to_mundra_port_distance.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_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 5564 bytes
SHA-256: 236a667b6bc9a4f12da0e0d491b2536b49e66dc253e4ce837bd7090e038f8c24
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 10492 bytes
SHA-256: 919b001a13b282126db58b46336af14832e3855ce00e81ec2b5d4628e4627c6a

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