Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a749ed5cd8e8b76…

MALICIOUS

PDF

76.3 KB Created: 2021-04-11 09:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb147598a78597c0ae57cd0e9b22086 SHA-1: 76a34c6f79649d92583cb2a8adb64840a10211ff SHA-256: 0a749ed5cd8e8b7644f6fec22005bcb04e0815358947efc12f2649f9e39c93fe
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation to distribute malicious content. The embedded URLs and the document's structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=how+to+upgrade+garmin+astro+320
    • https://tejaxoxujita.weebly.com/uploads/1/3/4/3/134368030/08a5551c12e9a9.pdf
    • http://ronifibofizet.medianewsonline.com/catalogo_pompe_caprari.pdf
    • http://dunotebuxa.22web.org/fotossintese_c3_c4_e_cam.pdf
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/1ac719c.pdf
    • http://bivasezi.iblogger.org/94694011956.pdf
    • http://pizidojokinesa.66ghz.com/pabonazibegibibosusagaxe.pdf
    • http://levojefozaloro.mywebcommunity.org/48415215556.pdf
    • http://bazufilonunax.iblogger.org/job_appointment_letter.pdf
    • https://ninafaguri.weebly.com/uploads/1/3/4/5/134592808/2308502.pdf
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/557757.pdf
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/ropipujunisu.pdf
    • http://runatem.66ghz.com/brother_mfc-_j6520dw_driver_uk.pdf
    • https://xovarexo.weebly.com/uploads/1/3/4/8/134895284/dizujibid-zoniz-vuworotevotelu-muduvupizu.pdf
    • http://femesugubu.iblogger.org/brushless_generator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nafakosoleg.epizy.com/14996831563.pdf
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_0aea397148b8494eb72ba7e6c2d73d1c.pdf?index=true
    • http://mimodiko.epizy.com/best_pc_games_sites_2018.pdf
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_d572f919f82c43a99fa2be5c226f6358.pdf?index=true
    • http://wasalesex.epizy.com/rukevenapatubo.pdf
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_c567425b62fc40b29d5bfa752989d607.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_f5ea5d6dc9354795a87b4c4f26653afe.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_2dd22a07e37049fbb8c71c5fc8d15d7b.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_off0000e8e7.bin
cea361cfc22d2bcf615f93d018794c34e999082193b723421bb9185a31f01880		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 5736 bytes
font_01_sfnt_off0000fc68.bin
09c1b658d52862a9395f33d777bdad884ead99ed0eb99bef7278935010d41a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 11096 bytes

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