Malicious PDF — malware analysis report

Static analysis result for SHA-256 746f64c3b4768741…

MALICIOUS

PDF

74.0 KB Created: 2021-03-18 10:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98196f76affd181ce3ae096214d2fcce SHA-1: 9e5e54fe729c94a7d3e29bbccefe91111f5221b5 SHA-256: 746f64c3b47687412ee9b4f753ecabc45724d3cc4d1273d24984d040bd77e53d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm, suggests the document is designed to redirect users to potentially harmful websites. The `PDF_SEO_LINK_FARM` heuristic further supports this, indicating a tactic to generate traffic or distribute content through SEO-optimized links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=sacred+marriage+pdf
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5fc854006a76b.pdf
    • http://siluduto.22web.org/every_praise_chords_eb.pdf
    • http://tiwirulesu.iblogger.org/what_kind_of_juice_can_you_use_for_mimosas.pdf
    • https://static.s123-cdn-static.com/uploads/4366017/normal_5ff431ee9f6d1.pdf
    • https://static.s123-cdn-static.com/uploads/4388158/normal_6008cab475ff8.pdf
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/9154314.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/nogebevi.pdf
    • https://bevarari.weebly.com/uploads/1/3/0/7/130740456/xemifutimimevaxe.pdf
    • https://cdn-cms.f-static.net/uploads/4470391/normal_6020bdbe49f1a.pdf
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/8c02b85bcac.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/9930789.pdf
    • https://static.s123-cdn-static.com/uploads/4445334/normal_6000c8d776eb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pidosowot.epizy.com/bsc_agriculture_syllabus_2020.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_37267dd46fb34d4290624e57eec1e909.pdf?index=true
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_c5329625100f4794b708d0d853e10288.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_a9909647b3794c338e56852564bf47e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed854438-143b-4512-a6e8-53e53f99a10e/what_is_the_reiki_master_symbol_used_for.pdf
    • https://uploads.strikinglycdn.com/files/b61fb9dc-3aac-4708-a2d9-e7dc609bd8b7/gipekesigonaranijibutire.pdf
    • http://mixonanax.epizy.com/83514210514.pdf
    • http://xogobitigo.rf.gd/68650192408.pdf
    • https://uploads.strikinglycdn.com/files/2e46ccd2-613e-4399-87a7-199ed4279af5/cuando_omitir_el_pronombre_relativo_en_ingles.pdf
    • http://felepav.epizy.com/asphalt_6_adrenaline_game_for_android.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_off0000e38d.bin
94b8daae75be0b1cec58e85c1a4353cfd5a9ebf18d72c418e2aeb4488ad3ff34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 5368 bytes
font_01_sfnt_off0000f5bd.bin
bdad124154890807839676f42e16c7fef2b69da93448bd52464eca9c920fa8e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 10864 bytes

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