Malicious PDF — malware analysis report

Static analysis result for SHA-256 75adbeb3292b3b6e…

MALICIOUS

PDF

71.4 KB Created: 2021-05-18 12:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b05bddc05c84a2a93d7b7a6103bc353 SHA-1: 2652edad45ceccf4ff1492c469b30c1e0ea9e130 SHA-256: 75adbeb3292b3b6eee820775daebb5c7c42a21f82bcf2e977828313effc347c3
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 link farm. One of the primary external URIs points to 'nipisod.ru', which is suspicious. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=diffusion+osmosis+and+tonicity+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4489057/normal_6025a617d3e44.pdf
    • https://static.s123-cdn-static.com/uploads/4376372/normal_5fed506916d19.pdf
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600f4ca2d210c.pdf
    • https://cdn-cms.f-static.net/uploads/4427267/normal_603a1e7e52a26.pdf
    • https://static.s123-cdn-static.com/uploads/4453129/normal_5fc99dc343411.pdf
    • https://cdn-cms.f-static.net/uploads/4369306/normal_606ab41175bc6.pdf
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd0ffe80e52a.pdf
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/bc8656.pdf
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/5177186.pdf
    • https://cdn-cms.f-static.net/uploads/4372682/normal_600bc79862f32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f38c42f2-0e40-4a35-ad7e-ac54980b7b04/63378541527.pdf
    • http://jesowafifu.rf.gd/business_turnaround_strategy_template_ppt.pdf
    • http://walofasokim.epizy.com/how_to_update_router_firmware_motorola.pdf
    • https://uploads.strikinglycdn.com/files/072ed5be-e486-4f41-92f7-7073f5ceda5e/english_grammar_for_students_of_french.pdf
    • https://uploads.strikinglycdn.com/files/c5852eed-10ae-4321-bcf9-8767d0b72841/20072037308.pdf
    • https://uploads.strikinglycdn.com/files/f181da84-35fa-4559-997e-ada14ab8a0dd/par_quoi_remplacer_la_creme_liquide_dans_une_sauce.pdf
    • https://uploads.strikinglycdn.com/files/980cbc2a-9f09-46b7-ac0a-b22a8df0addf/84586065866.pdf
    • https://uploads.strikinglycdn.com/files/e27149b0-33f9-4c60-890a-84f42893784d/88264921551.pdf
    • http://jewulepip.epizy.com/how_do_you_find_out_the_interior_angles_of_a_polygon.pdf
    • https://uploads.strikinglycdn.com/files/8225bd15-75d2-4c31-a498-362c9fec6a1e/77267090995.pdf
    • http://sosunakefimafo.rf.gd/777_qabalistic_writings_aleister_crowley.pdf
    • http://rewigikokisiw.epizy.com/46148689697.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_off0000d903.bin
12fcc6742b338d5b9dd2ec7b7d81a90c7c83972d1cc1eec73a3cc53345a43b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 5484 bytes
font_01_sfnt_off0000eba0.bin
d363133a957d9ba63db8ea6e1ba0c065229bb82b981c6362face4188e105947a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10684 bytes

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