Malicious PDF — malware analysis report

Static analysis result for SHA-256 da20bac1765d57f9…

MALICIOUS

PDF

121.9 KB Created: 2021-05-03 13:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367d9f431c0bc31b26ffeabc03d52eef SHA-1: 9437dc7659459c346fe7bae1383ca600933fdee8 SHA-256: da20bac1765d57f96ec459654e8f33c2721a897f56378dbc862e10b79fe11514
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. This suggests the document's purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://kuzutuzo.ru/strik?utm_term=the+parthenon+is+the+most+famous+ancient+greek+building.+what+kind+of+building+was+it
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/vapode-nopamomurevax-visitidupevom.pdf
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/7cc1c122.pdf
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/xutipesoduz.pdf
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/0360439c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/407e86b1-e00c-4c6a-8ce3-07ac3598d382/wovufawoz.pdf
    • https://uploads.strikinglycdn.com/files/ffd3b281-e340-4dcb-87f6-808912974c6d/how_to_use_a_george_foreman_grill_for_frozen_burgers.pdf
    • https://s3.amazonaws.com/kibavutibeved/53490537124.pdf
    • http://tumapaluk.rf.gd/53194194412.pdf
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_ad3d96ab46fb447f84f39747a8b00bdc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5f3c7501-a064-4607-ae7c-c2bfc642d58e/93762554997.pdf
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_14dc95f447aa4e72b9e8e5fbd54b6d29.pdf?index=true
    • https://s3.amazonaws.com/fejififimaketo/goxevemakagepu.pdf
    • http://xojurasonalefan.rf.gd/94557281586.pdf
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_ab9adf93826a4712b61ea43d2070ea76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d4c93e7-a056-4753-aefc-bb706baf1ded/casio_g-shock_dw9052-1b.pdf
    • http://tojuzurukepise.epizy.com/constant_acceleration_problems.pdf
    • https://uploads.strikinglycdn.com/files/1dcaeee2-6652-4f47-9751-41c3f74a9831/8133244116.pdf
    • https://uploads.strikinglycdn.com/files/52dc0fe8-0bb5-48b3-b287-04a9e4bc300c/savibagetirajitevo.pdf
    • http://bujubigakokuv.epizy.com/vanokobatejuwoxeg.pdf
    • https://uploads.strikinglycdn.com/files/0cbad165-9742-4e44-a58f-a146d3336b83/navy_seal_hand_to_hand_combat_training_manual.pdf
    • https://uploads.strikinglycdn.com/files/9779ea73-cb52-4e9d-afe4-81975d679eca/tepitesuzogawurapukodarof.pdf
    • https://uploads.strikinglycdn.com/files/4e543604-1a77-4069-81ee-3516638364ba/syma_s39_helicopter_instructions.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_off00019b75.bin
7de7d5e03e233ea102bd4784b798e56c29370e2b9e24b861ecc0cc73209d7e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B75 5844 bytes
font_01_sfnt_off0001af3d.bin
7abd55e40e10b51205e9e9d8ec9df9e3eeedcbc79304d7835a8d1577cb8f1440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3D 12496 bytes

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