Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e28cd32c90ba58…

MALICIOUS

PDF

73.4 KB Created: 2021-04-08 07:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bb1a00d5bb45ed5b6b528d1fa3fb453 SHA-1: 592fc1ce85056fbfd195258f5cc01c66d95e6bdd SHA-256: 75e28cd32c90ba580332adf2e3f8301616bab9354c1f170492dcf90f12f9f3db
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. One prominent URL, https://mezovuduw.ru/wix?keyword=m+budget+mobile+guthaben+abfragen, is directly referenced. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to mobile budget inquiries, suggesting a lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=m+budget+mobile+guthaben+abfragen
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd144bc122b4.pdf
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60637c63bca47.pdf
    • https://cdn.sqhk.co/betarudigi/Cjhd6gi/9593720390.pdf
    • https://goguzosuv.weebly.com/uploads/1/3/5/3/135343726/sokikuvowikelim.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/vebofaxoteriwop_belimujalil_masifozuxisuko_fixipot.pdf
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/nakosaz.pdf
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/xufovavopeboxo_rixitijolafamas_vudanot_dupamilemeza.pdf
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/74a1b81c5.pdf
    • https://cdn.sqhk.co/pixorikibam/jYvYmAg/kinojanasazuli.pdf
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/zolujivili-kojufejumu.pdf
    • https://cdn.sqhk.co/talurelope/ha1hehj/rizelewodug.pdf
    • http://zemavavidebades.22web.org/21538389183.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://romezegipoxo.epizy.com/jovojetirufazubefexegorod.pdf
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_beb0f5b8542f49cf94415b4c3f01bff3.pdf?index=true
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_7301ec36d5284c418213cc675493ed2d.pdf?index=true
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_25115e2b76e141ec8314319443a7844b.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_e8609f52fb4b42c3a31176c06283fce7.pdf?index=true
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_f4ea74211b314fe382a725354d7b2179.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_off0000dcfb.bin
9fadbbda08396c55a0b8bd8259cbcb69536f8ac2102d3b29099b590824f05b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 5288 bytes
font_01_sfnt_off0000eed9.bin
055119f7019528f4e7e1fc0663ab0ed9059fb4b7106c775ea0cafa60e801c6bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 12008 bytes

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