Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de956ca79230397…

MALICIOUS

PDF

91.6 KB Created: 2021-03-11 01:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 172d850cc1b5b7b2f92f175e42c3b7ca SHA-1: 185b265d070233d05d0f5bcfebcea5d0650a2139 SHA-256: 4de956ca79230397549560fd6ee134bc3e4725257efe79ea5d0cc5b68f961859
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to 'free crochet patterns' which serves as a lure. The primary malicious indicator is the embedded URL pointing to 'zajinet.ru', which is likely used to host a phishing page or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=free+crochet+patterns+for+super+chunky+yarn
    • http://robinmani.site/sidixakud276an.pdf
    • https://cdn.sqhk.co/dexijonur/ghjZvyx/92796806590.pdf
    • https://cdn.sqhk.co/segidexu/iiCibjb/voicemail_settings_on_this_phone.pdf
    • http://praktika-ingenieur.com/laptop_application_software_free45sr5.pdf
    • https://cdn.sqhk.co/jabisopomuxo/ehjEwge/physics_cat_memes.pdf
    • https://cdn.sqhk.co/dugelabomaw/je7igha/duck_hunt_horror_game_vr.pdf
    • http://winoorama.website/53675690257nc9qt.pdf
    • http://tezuzaxufasoxi.iblogger.org/nopipirokixipipesubibuva.pdf
    • https://cdn.sqhk.co/rufosopufu/Yhwjegf/mupiruworetikowovesupasij.pdf
    • http://zazuvivilug.iblogger.org/dotabuff_chaos_knight_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1bad667-61ce-41de-b4e6-80860c0cbbf7/bolikezeve.pdf
    • https://s3.amazonaws.com/bogeguva/fortinet_fortisandbox_datasheet.pdf
    • https://s3.amazonaws.com/muvazi/marodivovemukazupibi.pdf
    • https://uploads.strikinglycdn.com/files/f293e1e9-2256-4db3-b9e5-d9dffaa07179/hp_officejet_pro_8620_driver_windows_10_64_bit.pdf
    • https://s3.amazonaws.com/mexavofezoxi/80889497939.pdf
    • https://s3.amazonaws.com/makixibawumebol/heide_museum_of_modern_art_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/3b578b6b-d2a4-4151-bca9-6d4753b72717/sherlock_holmes_book_reader.pdf
    • https://uploads.strikinglycdn.com/files/4fc5ec64-ca71-4dc7-a58f-f5a34a6b786e/pronoms_relatifs_exercices_avec_correction.pdf
    • http://kewivifonawati.epizy.com/99206142495.pdf
    • https://uploads.strikinglycdn.com/files/367142e8-6588-403a-b84f-5756030f4453/tisukitarikuludituzis.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_off00012a25.bin
8fc0e9210f28b072359c68f5617b9973deddc1f22db303376f9c393e07d6012f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 5192 bytes
font_01_sfnt_off00013bdb.bin
4dbb7f6acf8c0e6f554a65efcb8c152a3bd01560ebcacd43194858be5398fe77
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 10940 bytes