Malicious PDF — malware analysis report

Static analysis result for SHA-256 82867bb6ca470c36…

MALICIOUS

PDF

71.0 KB Created: 2021-03-27 22:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be07753a248f9d7582af5260531799d6 SHA-1: 12e202b155fedcbfa1f135035a6bc995426a9d47 SHA-256: 82867bb6ca470c36260505c7da4eec14bf4242472973a04db4c1ec591dc88026
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The embedded document body, though heavily obfuscated, suggests a lure related to a 'timeline template'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pelibifir.ru/123?utm_term=multi+year+timeline+template
    • http://fatunatet.getenjoyment.net/automata_theory_and_computability_by_padma_reddy.pdf
    • http://jamotovoxut.mywebcommunity.org/zebevivebejeduv.pdf
    • http://jijuduli.mywebcommunity.org/42471388524.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/977658.pdf
    • http://pofaduxiruk.getenjoyment.net/how_to_lose_weight_upper_body.pdf
    • http://jefevivavifax.scienceontheweb.net/40498439415.pdf
    • http://dadefuxafovub.22web.org/75722287317.pdf
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/492d5.pdf
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/kaxadadalijex.pdf
    • http://bagidopivulo.mywebcommunity.org/southern_blotting_technique_steps.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bakoloj/biographical_information_form_template.pdf
    • https://s3.amazonaws.com/biwuwukesazef/armored_core_for_answer_cheats_ps3.pdf
    • http://jinegudizoropi.rf.gd/mechanical_drawing_notes.pdf
    • https://s3.amazonaws.com/xotomisen/85430346050.pdf
    • http://wonanikapudidak.atwebpages.com/berlin_map.pdf
    • https://s3.amazonaws.com/mojivikapeti/platform_shoes_white_cheap.pdf
    • http://fepujivorer.epizy.com/16718329020.pdf
    • https://s3.amazonaws.com/liluvad/informative_writing_topics_for_6th_grade.pdf
    • http://gevejonitu.onlinewebshop.net/ace_the_brainteaser_interview.pdf
    • 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_off0000d8bc.bin
ffc8f94ff9ced30b22325bd0e7f1521c85c062894c6fb5276a0d71f880161941		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 4896 bytes
font_01_sfnt_off0000e957.bin
3b5355812f9e716f25f6a45ca1c230139a6121bd58f79761a1dcfb1d0e673934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10584 bytes

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