Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea4c1fdb9705608…

MALICIOUS

PDF

101.6 KB Created: 2021-02-09 06:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b0583149cc170b82f066e361a3c37b6 SHA-1: 4bf15bc2dc76e9cabdf0c38a50937caa7535b5c7 SHA-256: aea4c1fdb97056086e67e986a6f5d860daef58538b4b69fc4d09a0b038088e19
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=ali+baba+story+pdf PDF link annotation
    • https://cdn.sqhk.co/tizarina/icheoec/multiplayer_driving_simulator_mod_apk_all_cars_unlocked.pdfIn PDF document text
    • https://vogavowaxataner.weebly.com/uploads/1/3/4/2/134266619/relima_xutulurun.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/polymer_bundle_farm_2017yaduz.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/hfifngc/nepavafuratujisadobuteton.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jjdqieL/diluruxemunaturavonitit.pdfIn PDF document text
    • https://jiwalevimube.weebly.com/uploads/1/3/4/8/134870165/mulukag.pdfIn PDF document text
    • http://miiliioner.xyz/gewetekqvs2.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/u0SVggb/71267998659.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/vulaguleraxelumepike.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Wihgju4/loft_store_near_me_now.pdfIn PDF document text
    • http://trokot-online.xyz/my_pillow_mattress_topper_cal_king7xzsp.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/3477478.pdfIn PDF document text
    • http://forexgeeks.net/hplc_method_validation_as_per_ich_guidelinesd28wc.pdfIn PDF document text
    • http://fridgeservice.ru/venuwuruwoxufamonagupunifya293.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/vavale/dbs_continuation_sheet_who_signs.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_off000152da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DA 5264 bytes
SHA-256: 9e0fa7bc51f4cfb57f0e0fbd12931d0ba8ae26a3962cd42d8bf3103fcbbaeb75
font_01_sfnt_off000164d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D2 10820 bytes
SHA-256: 0fd179c3595579214344deed9fe672accc8e394ab1bae1eee83556b161b6b1e3

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