Malicious PDF — malware analysis report

Static analysis result for SHA-256 749dd3990583f1c6…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 17:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e868612849d39d75471d6bc5b079addf SHA-1: d15c57aa8778992621858f877326a5f5912d4984 SHA-256: 749dd3990583f1c6edf231861705d70e6f4a1ead255473bbfdc4a0030d13dbf1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which, https://nipisod.ru/strik?utm_term=how+to+find+geometric+mean+formula, is directly referenced in the document's metadata and appears to be the primary lure. The document body, though heavily obfuscated, suggests a theme related to mathematical formulas, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+to+find+geometric+mean+formula
    • https://cdn.sqhk.co/togareguko/dhcigji/waves_tune_mono_tutorial.pdf
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fdf905868ada.pdf
    • https://cdn.sqhk.co/riketumes/AmQjfgj/liwagulekovato.pdf
    • https://cdn-cms.f-static.net/uploads/4466398/normal_603651312a1d4.pdf
    • http://givimemaregudum.sportsontheweb.net/list_of_general_aptitude_formulas.pdf
    • https://cdn-cms.f-static.net/uploads/4374986/normal_604a296ab7cda.pdf
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/sunirevenaseg.pdf
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5ffc9fc739e6e.pdf
    • https://static.s123-cdn-static.com/uploads/4479474/normal_5fe1ffd8b5c4a.pdf
    • https://rixulajo.weebly.com/uploads/1/3/4/5/134585814/webezifalirogo_sokematejini.pdf
    • https://cdn-cms.f-static.net/uploads/4416675/normal_60490a9d9c134.pdf
    • https://cdn.sqhk.co/farafakilof/rig0Rig/home_workout_no_equipment_app_store.pdf
    • http://dawexefif.getenjoyment.net/81325590031.pdf
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5fceeb796daf0.pdf
    • http://mitutepoka.medianewsonline.com/socio-cultural_environment_definition_wikipedia.pdf
    • http://rigoditibalun.mywebcommunity.org/ven_ven_senor_no_tardes_letra_y_acordes.pdf
    • https://cdn.sqhk.co/fedelubu/heiigcR/3386541097.pdf
    • http://tadosuzewamu.medianewsonline.com/can_you_whitewash_with_chalk_paint.pdf
    • https://cdn.sqhk.co/pitewomepe/jahgVKG/81563136574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sizemogigu.myartsonline.com/zonume.pdf
    • http://ziwemasux.myartsonline.com/tudunuvuwatoretalirujibud.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_off0000ed40.bin
d9adce28e0268c8fa5b91b5ef264e466c4f5950d2e0e4ed8babd13a3bdcff387
pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 5216 bytes
font_01_sfnt_off0000fefc.bin
43f0f463926420d2046fa335cc075ebb03d7f0e46b9afa0444440e557d730b40
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10012 bytes