Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b88fa69fac8dc28…

MALICIOUS

PDF

73.3 KB Created: 2021-04-03 08:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80b598fd0184666b97683a08f255e9f8 SHA-1: 80c5ebb7f60bc257e85a180e887028c4accf4dd6 SHA-256: 3b88fa69fac8dc28c77de9e340e1598b69f5e768584e5dcf214782b2c73bb169
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=forgotten+chicken+with+wild+rice', which is likely the primary distribution point for a malicious payload or phishing page. The document body, though heavily obfuscated, appears to contain recipe-like text, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/wix?keyword=forgotten+chicken+with+wild+rice
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5fd08f4546756.pdf
    • https://cdn.sqhk.co/detaludolef/dVzPgef/help_steps_neden_ad_m_saym_yor.pdf
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5ff323e1d02b4.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_604a920fae7f8.pdf
    • https://cdn-cms.f-static.net/uploads/4420617/normal_60353382cba42.pdf
    • https://static.s123-cdn-static.com/uploads/4380543/normal_6008416942f76.pdf
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5feb3c7fde73c.pdf
    • https://cdn.sqhk.co/baxoladipezu/4FSKDjb/come_play_ending.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_642b852149484ab397b3aae1607944d0.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_b44853e72ff6493989c787428e53e3b8.pdf?index=true
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_67b4cb2b3647436ba15e75a0cfd8615d.pdf?index=true
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_c40f481cab1f4c27a22ea4d195e6e991.pdf?index=true
    • https://uploads.strikinglycdn.com/files/decf0c92-b221-4176-9db7-0fdea080fbde/wozanutuvuma.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_ba4f471f7f1547fe8da09aeedaa0a103.pdf?index=true
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_c14186bbae7f461f933be576344a706a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07490b2d-e903-4abb-9d3d-0fdf9014bbb7/xajedajugudodebudowis.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_off0000e24f.bin
5efddfe12705e17f1e00eef917a015f15fc46e36381fe0e676e36657b44be78d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 4924 bytes
font_01_sfnt_off0000f323.bin
6492defccc8b5bc42d15ab3d076f0b0a3e657e35db4f37fd5ce9d10a984b937c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10980 bytes