Malicious PDF — malware analysis report

Static analysis result for SHA-256 834bb99750209d34…

MALICIOUS

PDF

70.5 KB Created: 2021-03-29 02:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320416f9627a85a9427a8379be17640b SHA-1: 17ef2e213649806b198f6e0b4d9e812e099b7b28 SHA-256: 834bb99750209d346dce59a1d9faacca15d50ba8ad9e09a38eb1495f9e335a88
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting a tactic to drive traffic to various websites. The embedded URL "https://maypoin.ru/wix?keyword=best+race+for+monk+horde" further supports this, masquerading as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent, possibly related to phishing or malware distribution through these linked sites.

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://maypoin.ru/wix?keyword=best+race+for+monk+horde
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/jobanuwonofovomebip.pdf
    • http://vojemodipu.sportsontheweb.net/wepidodosazavogozapure.pdf
    • https://cdn-cms.f-static.net/uploads/4413973/normal_60415f13af683.pdf
    • https://static.s123-cdn-static.com/uploads/4453328/normal_5ff0efeac2a1f.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_60168229c29a0.pdf
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ff8c6f279255.pdf
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/4896830.pdf
    • https://cdn-cms.f-static.net/uploads/4451754/normal_6039780969cb9.pdf
    • http://mogisut.medianewsonline.com/antenna_theory_analysis_and_design_by_constantine_a._balanis.pdf
    • http://sowakowakemim.mygamesonline.org/xekexadosusowalose.pdf
    • http://fanisore.sportsontheweb.net/platicas_prebautismales_cuauhtemoc_chihuahua.pdf
    • http://nenegifivujaxu.mypressonline.com/guviluxitojogoxoretisep.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6039576428a7a.pdf
    • http://benilobodereji.mygamesonline.org/dojabebizifigebamezala.pdf
    • http://dilawiputonu.mypressonline.com/livros_de_arthur_schopenhauer.pdf
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fe2f115acdaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_2e1ce330150540fb96cc208cd8491011.pdf?index=true
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_88b5b49579c84d6ead329b2e1631c163.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_781cbbdb64d2423d8ced6257aa462585.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_off0000d5bf.bin
805e8800eb5b9760d39295fb52f661bc316805c07b3013dc3d361048085bb923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5340 bytes
font_01_sfnt_off0000e7bf.bin
b287aff47d303b8196424b8965d5af4502a3d11075b9dabf479a0af10b940cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 11044 bytes

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