Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cc0d54d3e36ebb…

MALICIOUS

PDF

75.8 KB Created: 2021-04-22 05:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a930cc7e9800f67cd1ef110c0c095771 SHA-1: 57e37f966a40b2f05ce9fc0f6019754189189b26 SHA-256: d9cc0d54d3e36ebb155791a185fc967da34d4e9b752fdb479f31cd2d163093c1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/strik?utm_term=arduino+uno+r3+tutorial+pdf PDF link annotation
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/zupewi.pdfIn PDF document text
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/furijulufunopaderar.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/42877254436.pdfIn PDF document text
    • https://mimoleratamofip.weebly.com/uploads/1/3/4/5/134500060/6364037.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/nobakonun.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/6090037.pdfIn PDF document text
    • https://sewowifef.weebly.com/uploads/1/3/6/0/136082850/1cfce769583a.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/sozeduwotukaf.pdfIn PDF document text
    • https://libonatelizipo.weebly.com/uploads/1/3/5/3/135326144/7991081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novosumagib.epizy.com/metekinopozitemiposit.pdfIn PDF document text
    • http://pozonijegexovu.epizy.com/20922749828.pdfIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/vegirumubofudajigenoraxef.pdfIn PDF document text
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_fc56f4a3bd6d466da5aca03c61c307a4.pdf?index=trueIn PDF document text
    • http://xovefopu.myartsonline.com/the_apostolic_church_ghana_twi_hymns.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_722c47c59e6f4acfa168eade4add37bc.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_072cb8940c034eccba8ee45d3dba20aa.pdf?index=trueIn PDF document text
    • http://vopipewulowapa.rf.gd/eidos_commandos_2_free.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_122cf8c14a4043eb88e7dbd1dfceda04.pdf?index=trueIn PDF document text
    • http://kabexumowexugu.epizy.com/jegotogujetokuruwigirew.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_a50f2fe907b44ddb84b0cc5a16eae187.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 5008 bytes
SHA-256: 7e8512c5acc54d2540931119bc2df41c7356d4d86b821aa46f8150dc97075338
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10624 bytes
SHA-256: 3844176dba2f88cf7c52d03b709e52339d887b4cebfda012a95f1350eefec849

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