Malicious PDF — malware analysis report

Static analysis result for SHA-256 f732fd52b17f3e83…

MALICIOUS

PDF

89.3 KB Created: 2021-03-20 14:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ddcdc07a4125e52d34f3569735f44f5 SHA-1: d19b6a9bd9cbd238eff4e5af7071297c2b49e60d SHA-256: f732fd52b17f3e83032bb38a67eb3982c0653b90cb9670148ebe5efdce71a9fc
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine results. The embedded URL `https://jumiwimov.ru/wix?keyword=lamborghini+hot+wheels+20+pack` is likely the malicious payload delivery mechanism. ClamAV also detected this file as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`, further supporting its malicious nature. The document body, though heavily obfuscated, contains keywords related to the embedded URL, 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-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://jumiwimov.ru/wix?keyword=lamborghini+hot+wheels+20+pack
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/939e4f2dd.pdf
    • http://sivujelofad.22web.org/segagube.pdf
    • https://cdn-cms.f-static.net/uploads/4386335/normal_6046c7ea71ae9.pdf
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5fc63d3b1baa2.pdf
    • https://bimuwalunamen.weebly.com/uploads/1/3/1/3/131384226/munizasewaw.pdf
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/sekewu_dapiwujerodak_tabavozun.pdf
    • http://limevekobo.iblogger.org/vubozunosetenad.pdf
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fe239b2d4bf3.pdf
    • http://felulam.22web.org/sumokonufexapufo.pdf
    • https://cdn-cms.f-static.net/uploads/4411273/normal_6022cebc9ccc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_5a367d2c73ca4723a80c274d6d668bc6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a895db72-2363-465a-aa25-032c5f7bcd3c/is_honda_rebel_300_available_in_philippines.pdf
    • https://uploads.strikinglycdn.com/files/f76bef72-5399-438a-9dd1-0ab4809cba05/how_to_study_integration_class_12.pdf
    • https://uploads.strikinglycdn.com/files/f088d28e-f98c-406b-bce6-068324456269/ejercicios_de_porcentajes_para_quinto_de_primaria.pdf
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_6bdc0f9fc88543108292691e4028f8e9.pdf?index=true
    • http://repafow.epizy.com/6260866279.pdf
    • https://uploads.strikinglycdn.com/files/f78737ab-ef2a-4c23-bdef-c4da574daa9f/2000_dt466e_injector_torque_specs.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_4c06ed80cc65440e8e22b41e64492c19.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4d942be-e85d-49dc-8d84-383959bff147/dufotegirekudagobalete.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_89e22fd509ee42a4a238602a8e8c007d.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_off00011f74.bin
8cb6dcc1a2d3479d69c7373fa55b3ef4edb2573edda1415e60d8503e35c35efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 5860 bytes
font_01_sfnt_off00013350.bin
5ce39ebcfc4bf9048c6bd9c2c60aa4ec460aae3ed5926f5cefdfac426fd734c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 10648 bytes

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