Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2ae43906c2487…

MALICIOUS

PDF

73.2 KB Created: 2021-03-30 14:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 51c60fbb8b91c43efc585b9f9c04e717 SHA-1: 0a494719c966518c81bbfb0360a47536cccc9b6d SHA-256: fad2ae43906c24873fe79c6b6737c0d7b978bd7c634ffecd26e7b5180efa5e47
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, including a suspicious one hosted on 'soxebez.ru'. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting an attempt to manipulate search results or distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

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://soxebez.ru/strik?utm_term=organic+chemistry+for+dummies+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376850/normal_603dd52456c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_6027cc60370a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/06b3160e-53b6-47b6-839e-948503cf2078/how_to_use_console_commands_in_fallout_new_vegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be72f28-99ca-4b5f-8f4b-435bd8976241/tonivulomobazisaxunef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268119c7-5a63-45c7-a4d1-52fb2ec79350/emily_dickinson_poem_303_meaning.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_6dcb34e059e84d30962f979f5f955a37.pdf?index=trueIn PDF document text
    • http://mulapoxe.onlinewebshop.net/alkonyat_4.pdfIn PDF document text
    • http://gajopule.myartsonline.com/97763332349.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/data_architect_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1522d90c-7116-4d0a-8efb-36f32081400b/seiko_7t62_quartz.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_08f84adb9557432fad3200242eb7a970.pdf?index=trueIn PDF document text
    • http://betakudo.atwebpages.com/ancel_fx2020.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_1800c758eba640a4a80ee0a3421da35c.pdf?index=trueIn PDF document text
    • http://loxupobupibim.atwebpages.com/28575068667.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_ab94ccbf8a6d443cacf4a8919e8dc6b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9513f73-610a-4eaf-bc16-25925e029509/kitchenaid_mixer_k5ss_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/penikiripugimul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99537228-7352-48d1-95ca-1d70ba91e0ad/how_to_open_a_fire_safe_sentry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5647e2-5c5f-46b9-a31d-9c7c98bbd83b/kojama.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/nisojunu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 5548 bytes
SHA-256: e142e30b18ee319ecca50eb88f4c5051b56eea99f0d93d86878511b3e576472b
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10592 bytes
SHA-256: 1bd264b7d091ee2edc1cb13c163f12f353bb92a862d7dd711db76ba5b289ff4d
font_02_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378