Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b5d2d45f7a5f66…

MALICIOUS

PDF

106.6 KB Created: 2021-04-28 19:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1899df5ee0393764b1a67e57a9603c88 SHA-1: 2fc1957eb36f713e921910c5429c9bcb9b3f9f57 SHA-256: 98b5d2d45f7a5f6676eacbe1a75d2baeb0724e514603ac2cb8c9d4e1808e4a3b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as https://botokaw.ru/strik?utm_term=how+to+sue+walmart+for+discrimination, suggest a phishing lure related to legal action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=how+to+sue+walmart+for+discrimination
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/gadagutegawima.pdf
    • https://cdn.sqhk.co/gegojagakexu/Aljggfl/seworotepikopi.pdf
    • http://kurelifiw.22web.org/zodaf.pdf
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/nixabetuk-xowebuzesoj-kuluwelofezegir.pdf
    • https://cdn.sqhk.co/jukelifawap/eNibLFt/music_player_website_source_code.pdf
    • http://kubojep.iblogger.org/360_degree_leadership_assessment_questions.pdf
    • https://cdn.sqhk.co/noperizapewo/h2nggc9/highway_road_signs_in_kenya.pdf
    • https://cdn.sqhk.co/sejixikerut/Yjjhbie/susiveke.pdf
    • https://dabemevabun.weebly.com/uploads/1/3/4/4/134476179/6e587310491d.pdf
    • http://ketrovk.xyz/dr_david_jeremiah_app03qva.pdf
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/4016903.pdf
    • http://portkamesto.site/loniras13ikx.pdf
    • http://websporizle3.com/740031167162u1a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55722a44-d5a3-4ccd-86c7-9d2899b3f473/zavaropotixig.pdf
    • https://uploads.strikinglycdn.com/files/ffaa5f23-df8b-4748-bf54-9f3a0583e102/the_book_alan_watts_goodreads.pdf
    • https://uploads.strikinglycdn.com/files/235af77a-c179-42c3-bb44-c14a9b832a82/65495932436.pdf
    • http://dinupuz.rf.gd/99211298968.pdf
    • https://uploads.strikinglycdn.com/files/a8fd0fac-702e-4b37-96db-64add226cd0b/bamerodata.pdf
    • https://uploads.strikinglycdn.com/files/0f33f69a-2cec-4d5e-bcc0-98784ddf1a6d/how_to_fix_a_nintendo_dsi.pdf
    • http://nelipofamarul.epizy.com/geometric_series_problems.pdf
    • http://sumidemeg.epizy.com/ableton_10_manual_espaol.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_off00016586.bin
49138113b06b308d07cd5bdcd46f23d433b30773ee8477208d1fd999431e1122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16586 5220 bytes
font_01_sfnt_off0001773f.bin
ca579a5f5864b229d0e258f5cbdf9f2d615d5ca0e99349eb8aedfeda1edc846b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1773F 11260 bytes

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