Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1582b42b211ed…

MALICIOUS

PDF

71.2 KB Created: 2021-04-05 07:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f240ae39180e3174d1e97a8561e50a2 SHA-1: 560a0c8e0577a1105417f979932db35ad5bd3537 SHA-256: 88f1582b42b211edc2405d64348ed2a7d376f73e2427847ad95330a68be96052
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 'kuzutuzo.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, appears to reference a product, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=microsoft+xbox+one+wireless+controller+battery+pack
    • https://cdn-cms.f-static.net/uploads/4490542/normal_6023f32441706.pdf
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5fe5291d15fc0.pdf
    • https://cdn-cms.f-static.net/uploads/4479474/normal_600b43eb0b145.pdf
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fe0e266830f5.pdf
    • https://static.s123-cdn-static.com/uploads/4428035/normal_60041b8d55b25.pdf
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5ff54155827fb.pdf
    • http://mufikisa.22web.org/78370686941.pdf
    • https://static.s123-cdn-static.com/uploads/4425921/normal_600479412534c.pdf
    • http://fezibinuzot.iblogger.org/81744393487.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_606647b48c750.pdf
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fe481139fc8c.pdf
    • http://witikotuxigere.scienceontheweb.net/wawipinuwusukakosubinamup.pdf
    • http://nubuxeki.scienceontheweb.net/pezusexorudipug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://popeganezawojeg.rf.gd/tavuzerodopowitopa.pdf
    • http://sivumokevidosib.rf.gd/53036039295.pdf
    • http://nuluwajewugutik.onlinewebshop.net/vekelesepagutemuzi.pdf
    • http://pulutugorivexek.atwebpages.com/att_-_crl32102_dect_6.0_expandable_cordless_phone_with_digital_answering_system.pdf
    • http://puzasapexuwuju.epizy.com/sopuwosifebel.pdf
    • https://s3.amazonaws.com/rodakarugupoko/free_bandicam_pro_full_version.pdf
    • http://likuxusodim.epizy.com/activity_based_costing_abc.pdf
    • http://gefutikavuza.epizy.com/59511463430.pdf
    • https://s3.amazonaws.com/wulotugadag/aloo_kachaloo_video_free.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/kuwimowigejefumezijaron.pdf
    • http://kexemejalo.epizy.com/62990561303.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_off0000d5ec.bin
1e92e0c27caa3e84f65165ce19bc29c12cee001f5bdf7fc3080ef7bcc1e3cf7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 5480 bytes
font_01_sfnt_off0000e8d0.bin
2caa1e13b30e9ad1e6409733b5428eebc5ea65d6d6efb6fece4eb276669644cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 11120 bytes