Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4e05082027fa83…

MALICIOUS

PDF

76.2 KB Created: 2021-04-18 22:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4eb999fd54730115ea23f92baf7b8ae7 SHA-1: 1099f389e0877ac8ac31d55f099c453ff651fa72 SHA-256: 6a4e05082027fa83a28d71e18859c348663d582f13cc9879ef7c0f5982333f4f
186 Risk Score

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 0.9997

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://maypoin.ru/strik?utm_term=what+is+arby%2527s+sauce+called PDF link annotation
    • https://cdn.sqhk.co/tefazaturar/iaSUFAa/brother_color_label_maker.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/muvinijesoxofo_nerajonuw.pdfIn PDF document text
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/8901831.pdfIn PDF document text
    • https://votobadopa.weebly.com/uploads/1/3/1/4/131483772/lijikewowiz-jivibu.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/depth_first_search_algorithm_in_artificial_intelligence.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/aNlqDeB/the_royalty_family_call_videos_2020.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/27204595545.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/how_to_clean_the_jets_of_a_whirlpool_tub.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/thinking_with_type_2nd_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/jjahglK/voice_translate_spanish_to_english_speak.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/jkYjbYQ/back_wars_game_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_8c18e40552a547a7b31aed64c2d7dc35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/baxirir.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/electricity_and_magnetism_purcell_2nd_edition.pdfIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_5b06ab90e20b44b2b2cca1d488db9d35.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_22bdc019ecae414a92e389827ab0a837.pdf?index=trueIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_5ab3c17c75244ab6881e0de19fb92871.pdf?index=trueIn PDF document text
    • https://5db246a0-94da-4013-9f64-c970003367b9.filesusr.com/ugd/ca5179_a4f3a3909aed45b89c4dae93339f27ce.pdf?index=trueIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_527b207b972843848e4ecaeddd5e8ed1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/importancia_de_la_atmosfera_terrestre.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/73158517721.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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 5316 bytes
SHA-256: d4603ca48994df888e0a7130c991cfc60adbfdcb3959876a3d0dd1ff7958fa68
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10836 bytes
SHA-256: ef82b5dd14e10ca3babe3b5496a2d178030a23f9bfabe47c634d0ca4cc593871