Malicious PDF — malware analysis report

Static analysis result for SHA-256 e445b6a740c5b3f9…

MALICIOUS

PDF

73.3 KB Created: 2021-05-20 15:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d75d8856679213ba681df7b152753e49 SHA-1: 89934ee3f2776ee27ed2e58adb8a37f31d0a2f87 SHA-256: e445b6a740c5b3f97cbea723e4a0228779e443a99256b3abcb665ddda9dd4b7b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO abuse. One of the primary external URIs, 'https://resalured.ru/strik?utm_term=zumdahl+chemistry+10th+pdf+download', suggests a lure for downloading a chemistry textbook PDF. The ClamAV detection and ML classifier strongly indicate maliciousness, likely phishing or trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=zumdahl+chemistry+10th+pdf+download PDF link annotation
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/simekebijozeb.pdfIn PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/xixeb_tejeje_merotipegula_nigujiduxewuw.pdfIn PDF document text
    • https://lifofokir.weebly.com/uploads/1/3/1/6/131607054/6320846.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/72852584e6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e3c7ed-924a-495b-9326-910129fe9974/37431463765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4867e4a-8d37-461a-a8af-5da415b29c0e/xatevanutuxorezobekowupiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f29268a-7e65-431d-bb8a-c8c4f18af0b7/rothco_tactical_bdu_battle_dress_uniform_military_cargo_pants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbaee3f-a8bf-4738-93b5-3412ac573d4e/zokovisewajureweveziwodap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132d3f1a-a4cf-414f-a3d2-40add0003928/tomar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a2788f-3f2d-40c8-84cd-bf2aae6c3d02/craftsman_2_gallon_wet_dry_vac_bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7099b24-5de1-4e00-9d88-0b3109e8210a/what_is_the_cubic_feet_of_my_kenmore_refrigerator_model_253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518e81c5-153b-4a3f-8f66-7564f46bf007/how_to_use_blood_pressure_wrist_monitor.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/52817083487.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/94262849809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6908f4-c357-46df-b7e6-f9ed9fb08674/20013678788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501b499e-a22a-4ede-872b-4707372993a7/96777853679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e6dc0c-d178-496c-9e48-16673a1c26b2/toyota_corolla_2009_engine_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778534ff-1288-4e6f-a01d-7213b8b052c3/how_to_pair_i-pilot_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7500c08c-b5e2-41fb-b7a2-3553f033418c/pokemon_alpha_sapphire_walkthrough_psypokes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a7d3bd-593e-43cb-baee-7aa603940167/nomowi.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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 5740 bytes
SHA-256: 03d477e59b4b1c445272f9024ae74d517a091080bc326d2e40b00b1ceb96c759
font_01_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10340 bytes
SHA-256: 3171a32200ae86de4b3083f7d806560826f51b879ca9b876a61f069f7c4031e8