Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22a12df3ebf5386…

MALICIOUS

PDF

75.0 KB Created: 2021-05-25 12:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 053981c0ffcd8281e105956883eba474 SHA-1: 19955dac4c6f17f8a323985c037a74dc7666e2a6 SHA-256: a22a12df3ebf5386380de5c79a60c54c8ae360af560e6714107d7f28d11ef222
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing attempt. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=what+is+diabetes+self+management+education', is presented as a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' and the sheer volume of external links indicate a malicious intent to redirect users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=what+is+diabetes+self+management+education
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fe67a5485d93.pdf
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/vavebirotumomi.pdf
    • https://static.s123-cdn-static.com/uploads/4475989/normal_5fee681722dba.pdf
    • https://cdn-cms.f-static.net/uploads/4464302/normal_5fe8eb015a548.pdf
    • https://cdn-cms.f-static.net/uploads/4450140/normal_60477351219ee.pdf
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/deremogimasik-vodolomirunavud.pdf
    • https://cdn-cms.f-static.net/uploads/4454679/normal_600c5225e0200.pdf
    • https://cdn-cms.f-static.net/uploads/4425738/normal_6050436cd3a59.pdf
    • https://static.s123-cdn-static.com/uploads/4453579/normal_6007fe7b8626f.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_605fdc59c4001.pdf
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fea24cbc880f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pesetufavo/the_braille_system_reading_answers.pdf
    • https://s3.amazonaws.com/mikibetiv/85632611717.pdf
    • https://s3.amazonaws.com/tikoweravisixu/61188649589.pdf
    • https://uploads.strikinglycdn.com/files/0eb5b8a5-75ca-4b75-bfca-7e84cf323803/13480349311.pdf
    • https://uploads.strikinglycdn.com/files/5f2cb5b6-c7dd-42b9-8066-1403c33cb2d4/jezameruwokagowuzugelavib.pdf
    • https://s3.amazonaws.com/tixeligufokup/kopuzadedo.pdf
    • https://uploads.strikinglycdn.com/files/fe181d8a-6650-4055-8758-e2ef15394b13/jidiretunadorolebeni.pdf
    • https://s3.amazonaws.com/setaxilitozuko/kyocera_e6560_recovery_mode.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_off0000e88b.bin
f4074e188f5cf38307a243482464e4c0044d6822c9dd3e7188defbb186491b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 5492 bytes
font_01_sfnt_off0000fb24.bin
ab0f073f4c5190ce3b12cd210fa43d2d9bcf7955999dcdd6ae8b669bc6d785ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10296 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.