Malicious PDF — malware analysis report

Static analysis result for SHA-256 968c62d8e2e63f5d…

MALICIOUS

PDF

99.2 KB Created: 2021-03-18 06:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d20b74fba5de72e06acab8086dc5d9b SHA-1: 362846f63d76f0efb88849709773fad293f02c32 SHA-256: 968c62d8e2e63f5d10976e8bd8e4e154dc7dda7beb50572b8732baf9ee06efd3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism for SEO manipulation. The primary URL, 'https://baarspo.ru/wix?keyword=stick+wars+2+hacked+unblocked+games', indicates a lure related to games. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious intent to redirect users to potentially harmful content.

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://baarspo.ru/wix?keyword=stick+wars+2+hacked+unblocked+games
    • https://cdn.sqhk.co/libazosu/aihivaX/gitafitafafozesujomor.pdf
    • https://static.s123-cdn-static.com/uploads/4422912/normal_5feb32f6bde5d.pdf
    • https://cdn-cms.f-static.net/uploads/4445869/normal_5fd34ed2259ac.pdf
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5ff964187389a.pdf
    • http://kelnoteres.xyz/vesulibiwojozofabnt3t.pdf
    • https://static.s123-cdn-static.com/uploads/4425916/normal_60076f54e99f9.pdf
    • https://static.s123-cdn-static.com/uploads/4489032/normal_60041725ed798.pdf
    • https://cdn.sqhk.co/seworani/ggjEAz3/14244553376.pdf
    • https://cdn-cms.f-static.net/uploads/4482623/normal_602484b8d6d39.pdf
    • http://teren.fun/kufiribigjz.pdf
    • https://cdn-cms.f-static.net/uploads/4488323/normal_602581c72debb.pdf
    • https://cdn-cms.f-static.net/uploads/4369486/normal_60175e6e63b99.pdf
    • https://cdn.sqhk.co/mibajufaneja/3FLgdr7/xijewizifevapamipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ab3cdb63-526b-48e6-b78b-fd8f1c699c57/gy6_engine_carburetor_adjustment.pdf
    • https://uploads.strikinglycdn.com/files/27b17277-91e4-45d9-9c27-5c2cfa1f9902/right_to_travel_without_license_canada.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_13419d86355d46549b44bc3cac7f0d50.pdf?index=true
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_e1041a58740e4c89ab056b8781449768.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e51.bin
a9420c8be3ed83cbcf027c59892d96dfc005b5ba48b9ed0464c8c6e187552e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 5884 bytes
font_01_sfnt_off00014243.bin
bbe865e70ec479dde2d8f902fa8ae79c3109db75f94ae7cbc5dd1f445eaa9d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14243 11908 bytes
font_02_sfnt_off00016a59.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A59 16164 bytes

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