Malicious PDF — malware analysis report

Static analysis result for SHA-256 f313c9312de1a26d…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 00:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cb77bbc27e6648f5195bb474e075d41a SHA-1: d6b00313e8f58946d2727e1fbd4cdfe08c674f58 SHA-256: f313c9312de1a26d6e5a72e34fd044c30d348007612eae444394fbbc6c0209f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+to+remove+sim+card+from+lg+g7+thinq PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5fdcf87812854.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/jjpibtA/rage_z_multiplayer_zombie_fps_online_shooter_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/TGYigij/nagedugavopuribit.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/jdXdigF/colony_attack_apk.pdfIn PDF document text
    • http://rebelliona.online/how_can_i_learn_basic_electronicszq3y6.pdfIn PDF document text
    • http://cetapp.xyz/pisexekuzejosonegifekirlho9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5ff1ec08d5989.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/HJThe9k/drum_sheet_music_jump_van_halen.pdfIn PDF document text
    • http://luxshop21.site/oromo_amharic_english_dictionary_apki14u6.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/zavafa.pdfIn PDF document text
    • http://vitrinachel.ru/jurokoratovebed5hi6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/99686143478.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/backup_android_text_messages_to_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/53900892241.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5756 bytes
SHA-256: df120a383097557f669e855cd756fb2aecf8ad2253065938f4c8194c4433c99b
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 10564 bytes
SHA-256: b2b60fbca438454761938efc4ffc9aff2ef45d66580e7fcae88c32aa72a35a92

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