Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2bb6c240db6d50…

MALICIOUS

PDF

89.6 KB Created: 2021-05-30 07:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d711174de2cbcebdbb4dd05c6c3ed33 SHA-1: df3ed4b8de9f773853ee2265b5fe4fc649e974cf SHA-256: ff2bb6c240db6d50768b6089e35a82ab7a27ba4fde03959a7d6881acfcae103a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting malicious intent to manipulate search engine results or redirect users to harmful sites. The ClamAV detection and ML classifier further confirm its malicious nature, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external links points towards a phishing or malicious redirection attack vector.

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/strik?utm_term=is+cvt+better+than+automatic
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/ranejalemo.pdf
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/956910.pdf
    • https://static.s123-cdn-static.com/uploads/4414491/normal_60054e335923b.pdf
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60285bab6458e.pdf
    • https://todisosoban.weebly.com/uploads/1/3/1/0/131070867/5376795.pdf
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/mobuninapema.pdf
    • https://burodinijosago.weebly.com/uploads/1/3/0/8/130813714/kodutiwup.pdf
    • https://tetafawewaze.weebly.com/uploads/1/3/4/3/134378669/rodivadevosotam.pdf
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/21b7a80d3ef7d.pdf
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/f92ec.pdf
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6020b989f33ee.pdf
    • https://pirebuvix.weebly.com/uploads/1/3/2/7/132710697/feribi.pdf
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/8766723.pdf
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/bajawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/40ea3c75-c057-4404-a0b7-bb94c8daf64a/educational_psychologist_degree_distance_learning.pdf
    • https://uploads.strikinglycdn.com/files/a9df060f-42d3-474a-917e-e2fb256ae62e/how_to_clean_flame_sensor_on_lennox_pulse_furnace.pdf
    • https://uploads.strikinglycdn.com/files/06d4e553-5748-4082-9d4a-a865d5ce0cc5/graphic_design_portfolio.pdf
    • https://uploads.strikinglycdn.com/files/46e6c0fc-fa8f-4dcd-bd5d-4999edcf4c80/dark_souls_2_cheat_engine_item_swap.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_off000121e4.bin
c295cc17b02de807352af05e56c8a6342e69beecb40d3b2407cce985df93eabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 5144 bytes
font_01_sfnt_off00013341.bin
48a485c53d5fe447ffaf21429ad656aa42bddd1d4a1800ebe76adf49795423b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 11172 bytes

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