Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8528cc7d3c1e9db…

MALICIOUS

PDF

117.6 KB Created: 2021-04-02 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 54978f30a2f4a1149713df33519981cd SHA-1: de6d95084e6d5ba41440ed2cabb34583f20ab201 SHA-256: c8528cc7d3c1e9db7b1e9842b274441c746003b6336527691bf5009c83821455
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm designed for SEO manipulation. One of the embedded URLs, 'https://soxebez.ru/123?utm_term=android+studio+project+source+code+free', suggests a lure related to software development resources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/123?utm_term=android+studio+project+source+code+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494451/normal_6063473e7411e.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/jbsifjb/golden_globes_2015_viewership.pdfIn PDF document text
    • http://detonic-ordina.website/65042040642k1jpc.pdfIn PDF document text
    • http://lunesygets.xyz/black_rifle_coffee_reviewgfacw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_60268524afdfa.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/jigiajb/52330409237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_600d61df18c6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zasepo/zubafi.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_d044434c8ad24b6eb8ba3736efbff380.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a53f256652b84912ad6cbbbf2af5af71.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_9a25bdc80ad344408bb41fc1fbf611cb.pdf?index=trueIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_e59a800f5fc54609842fdf57c9df0250.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/natujulewasa.pdfIn PDF document text
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_e035bffc06b6475794a1922b753d5f9d.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_e61c2a6d340a4bc2868367e78e9a59f1.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_a4e01f10eeb84a61b8017742016af867.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/zunufovaxal.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/betting_apps_android_install.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/how_to_calculate_magnitude_of_horizontal_force.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_61f44342ead14b748e9153c655734fb0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000192b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192B4 4972 bytes
SHA-256: 63cd7e690556e446372550cca058a6c0cba229d2ffe0bc6f574723a2be169962
font_01_sfnt_off0001a3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BA 10924 bytes
SHA-256: 6fc69b1249647bbdccd47fb37bdc373380500862329182935a8712c48f3435c8

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