Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50bfec89f85cf7f…

MALICIOUS

PDF

100.2 KB Created: 2021-04-13 06:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af2c6d095b8c10ff410829685a8c51db SHA-1: 25699dbf2cbf6da3cdced5b042c7984f30719dd4 SHA-256: b50bfec89f85cf7fb95eed817b977a836a103011f9065f6ba63f9e861d3183e1
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, with many pointing to disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/strik?utm_term=dibujos+de+caras+faciles+paso+a+paso
    • http://lezobul.medianewsonline.com/bba_subjects_semester_wise.pdf
    • http://bumadodari.iblogger.org/weight_training_chart_for_beginners.pdf
    • https://static.s123-cdn-static.com/uploads/4483854/normal_600602b568122.pdf
    • http://suvolupijiro.mygamesonline.org/broward_college_south_campus_map.pdf
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/fesuwawusut-pezoxepapeseve.pdf
    • https://cdn-cms.f-static.net/uploads/4384482/normal_606ddea136a4d.pdf
    • http://kimujedat.mygamesonline.org/64346982329.pdf
    • https://xowetigebunagu.weebly.com/uploads/1/3/1/6/131637365/woruwanaruvexojite.pdf
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/a59dcafa25.pdf
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/luwixuv-gidojeb-buxemodotiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruwevabebivis.epizy.com/xororudolokax.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_efa3b33a2d4744a7aa23f65d21fed611.pdf?index=true
    • http://gizugutopaf.epizy.com/raf_air_cadets_uniform_regulations.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_b1e6d33495454b669d0cac6181f07b89.pdf?index=true
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_844aca28e1804c9a8a843c9f854daeec.pdf?index=true
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_99c1ccb4707f4eab9cd3714dc0162456.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_3b908815859d40dd81a2f907378fbdb9.pdf?index=true
    • http://vujapoguxesak.myartsonline.com/vegetarian_bodybuilding_diet.pdf
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_7cc6ca65a7434f739cefeefad65e7f75.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ba3.bin
b4ffaeec41068efd08f9d040a1c68d043d0a08b55063dc3c5b34c234ca8e4600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA3 5364 bytes
font_01_sfnt_off00015def.bin
5116d616bd642f6646992c63f383b6a4f2ff0b7ecbeee52f2bf0a70a9c84d611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEF 10920 bytes

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