Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbde86cbc9936946…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 09:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f0328177b373356d0d5cb0a399cf4ca SHA-1: b5b059701cccb3c1253fd503a94cf583cf527101 SHA-256: cbde86cbc9936946309fdec21fee9f79927a4c137a4d99823fe5d7a526cfce9f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. One of these links, 'https://botokaw.ru/award?keyword=shrinking+pdf+size+mac', appears to be a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=shrinking+pdf+size+mac
    • https://rugulobasogaje.weebly.com/uploads/1/3/4/7/134770789/49313c5ed7.pdf
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/6845279.pdf
    • https://paporese.weebly.com/uploads/1/3/1/0/131071113/8313676.pdf
    • https://cdn-cms.f-static.net/uploads/4464311/normal_603c4eb6afeb3.pdf
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/jafeva.pdf
    • https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/laxarix.pdf
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/6299349.pdf
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/fafuzevoviram.pdf
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/vilusirufeme_fikefijemoz_fovobun_xagesim.pdf
    • https://cdn-cms.f-static.net/uploads/4382974/normal_603f0ef94d8c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajeloninesitel/33515668307.pdf
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_70fd7831e0e34e109e64084a96a31971.pdf?index=true
    • https://s3.amazonaws.com/novipaliwid/44082507548.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_d7160d9568164ddca84692f8c781a883.pdf?index=true
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_eb76619e621c4e98be756a7ab688dd65.pdf?index=true
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_cdadb269619344778693b153ca3d7fbc.pdf?index=true
    • https://s3.amazonaws.com/kotodur/47959593408.pdf
    • https://s3.amazonaws.com/kibavutibeved/73235655973.pdf
    • https://s3.amazonaws.com/vapelurowar/maxafud.pdf
    • https://s3.amazonaws.com/faduxodiwo/free_hourly_appointment_calendar_template.pdf
    • https://s3.amazonaws.com/tidigudetefumof/zifezavuwupositepuwosejep.pdf
    • https://s3.amazonaws.com/jivuxo/iso_17025_quality_manual_template.pdf
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_c6620230c07c457b8dbf45b1cc2a11c9.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_off0000fad0.bin
b1be700c742ce553aa38bf3943c9150d7e60d5f94a0fdb227146e9aff695ec75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 5756 bytes
font_01_sfnt_off00010e4e.bin
2d5ce6db78ae92ceb7e797600179a6528d0bbf9c8bb88f061a12f9d2e871f4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 11820 bytes

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