Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eae5058aa3e3dc…

MALICIOUS

PDF

73.5 KB Created: 2021-04-02 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2e01138fe497f08ee876c2bf7a0c5ad SHA-1: dd7674672dd39d906ff626805638dbbd89fb790e SHA-256: 11eae5058aa3e3dc3edeaa5a20ad36728e03e6d44552de8138918de0a2a3b071
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a mass of external links, with the primary malicious URL being https://pelibifir.ru/strik. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+onyx+cape+town+reviews
    • http://bovibuvebus.getenjoyment.net/the_presentation_of_self_in_everyday_life_quotes.pdf
    • http://detozube.scienceontheweb.net/77214639325.pdf
    • http://nufudoze.getenjoyment.net/anomalias_placentarias.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_601711a93cdf6.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_601496704bd5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_1bc6b6c21d8b47219c12861a84aa58c0.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/tiselile.pdf
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_669f34e3377941189ffa5397b8c6fa5f.pdf?index=true
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_f56f4146125647e0bc3999a1a12d802f.pdf?index=true
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_c1fa47a3213e48299f1cbbd7a9c0ddf2.pdf?index=true
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_a53cd926b2cf40ae963e906ee938a24a.pdf?index=true
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_c7c0ae18c8c74aeeb1bdf6587f7e34bd.pdf?index=true
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_b6175cee3a6d407f8194b70177c2a7b1.pdf?index=true
    • http://kigagizotag.onlinewebshop.net/vanifamumujolozovubaserof.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_b65e807d20704dacad7485fdd34ca330.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_38cb62f0d90240cdb1bdc0ea1b45063b.pdf?index=true
    • https://s3.amazonaws.com/tumasun/40991794335.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_9ea1498977e745c8b4f56e7b1290d686.pdf?index=true
    • http://namezenidel.onlinewebshop.net/biological_nitrogen_fixation_mechanism.pdf
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_895c86b927084d689d1b84a9c1e7faf0.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_off0000e05f.bin
3164c00c09abb9e0e91dd840842a8a9b078d0fee3988f86e06dcb55ac0c6d88c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 5260 bytes
font_01_sfnt_off0000f260.bin
600a4d92588b99564090e9a4c3a130cb7e32d620bcf513432bbb3cd0021ed47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10912 bytes

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