Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1bf36488b60d90…

MALICIOUS

PDF

85.5 KB Created: 2021-03-21 08:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9d2dd1e5d29f6a9ed9a58b68175f39 SHA-1: a2b3c61132044469b09274d4236298f1b8ce16bb SHA-256: 6e1bf36488b60d908d134c898fbc7af971539371844d6202f35fefd4f435876c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content, potentially for credential harvesting 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://golowaki.ru/wix?keyword=suffix+meaning+in+application+form
    • https://cdn.sqhk.co/matelasoguje/Veij5hi/winner_soccer_evolution_elite_apk.pdf
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/4999561.pdf
    • https://cdn.sqhk.co/tiwumixe/hcGEidL/42487712189.pdf
    • https://nukegakisuwagaj.weebly.com/uploads/1/3/0/7/130739250/sibamobumivi.pdf
    • https://cdn.sqhk.co/keropolor/jhGCkge/7665002137.pdf
    • https://cdn.sqhk.co/togokitaz/fAjde1d/noredewiroro.pdf
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/lokole.pdf
    • http://sozawakofuriwoj.getenjoyment.net/dna_uptake_during_bacterial_transformation.pdf
    • https://binimejo.weebly.com/uploads/1/3/4/6/134665204/1485965.pdf
    • https://cdn.sqhk.co/lojibuwe/ieghejj/little_nightmares_walkthrough_chapter_3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xirixepo/producer_examples_biology.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_d113f184e98447cc93455d851ce86400.pdf?index=true
    • https://s3.amazonaws.com/sefipa/mathematics_questions_and_answers_for_grade_11.pdf
    • https://s3.amazonaws.com/gimufesajo/povifepugaparigawaganofu.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_e04bb43737bb4bde8b4572826b330f5f.pdf?index=true
    • https://s3.amazonaws.com/vuxagixil/charity_pick_up_old_furniture.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_6d1453ee458447b6a7fe01a7f2c59712.pdf?index=true
    • http://nivuzujanux.myartsonline.com/folepidawawadoneg.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_67ae6b76c97c408e9c20f5b761bd3a01.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010165.bin
10dfebe68342c8e33da2a7fe881acf4faa07cc2a74f788da6be71fd8ca853902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 5212 bytes
font_01_sfnt_off0001130a.bin
ff05a2c4cbac2de9a7797bbaf10ffae832a0c1433311bc12929a1aa33d21b3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 11492 bytes
font_02_sfnt_off00013a37.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 4324 bytes

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