Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4dd63e6732ab22…

MALICIOUS

PDF

123.2 KB Created: 2021-03-12 17:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 56faeb93ffcaf33bb3c9edf33068ad42 SHA-1: 0e329a4ea5e3726ec984991c51206ad30a9c3bf2 SHA-256: 1a4dd63e6732ab221118da41f40dd3272dfc10a2a32106e38a68b16d3775ff35
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'mezovuduw.ru/award'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://mezovuduw.ru/award?keyword=bandiera+europa+pdf PDF link annotation
    • http://fionainthefield.org/rocket_mass_heater_for_sale_ukdkrj1.pdfIn PDF document text
    • http://tazizaj.iblogger.org/meduse.pdfIn PDF document text
    • http://vivofuma.66ghz.com/96933382594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_603f18fc62aca.pdfIn PDF document text
    • http://copyright-securityx.com/60178529576nij3g.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/5351078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_5fd90bf291e31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5fcbe1d250f1b.pdfIn PDF document text
    • http://silvanozito.online/mycbseguide_class_9_social_science_ncert_solutions9sb2n.pdfIn PDF document text
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/dewata.pdfIn PDF document text
    • http://kodixoxetava.iblogger.org/takobenemogumi.pdfIn PDF document text
    • https://zazoveju.weebly.com/uploads/1/3/1/4/131407355/571e33f541d6451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_6035b64b7f797.pdfIn PDF document text
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/jiwek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_162472b8de66430da846c4fe254f38b8.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_36a1aabd464849be9dc54c90dac1c6d3.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_7aeef6f6ce0a4eb5ac1a5506ca2fa0b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a20088-86ea-41e9-9322-6e7737013b6f/how_to_lose_weight_fast_while_eating_junk_food.pdfIn PDF document text
    • http://vaxeniwojogu.epizy.com/corsair_k95_rgb_platinum_mechanical_gaming_keyboard_cherry_mx_speed_black.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_4fd53cbff7184daea37baf2f6236539d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30020961-1cb0-4e20-a075-dd05d21d0b89/how_to_clean_vent_under_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4dcfd9-ea8d-448f-9bbc-6babdac5ddb2/36736366260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e87d6e0-da49-4e92-adc9-6b31a9c112f6/xazupunop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4920f2-e572-4f32-b729-b1d024a525e2/who_wrote_the_first_4_books_of_the_new_testament.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_off0001a6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6AC 4872 bytes
SHA-256: 7f5af960cc7c8364fb6eeca93f034936a4a3b578532b7c0e1f2ed4ab83c5a65b
font_01_sfnt_off0001b751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B751 11760 bytes
SHA-256: 6f233cf1493aeffac2d4933bc619e7f2a42e751f61db5e190f2805c4608c5a15