Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f55ed6fac8b6245…

MALICIOUS

PDF

77.1 KB Created: 2021-03-04 22:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc77bd6e43df2e0fda254bcd1e4b837 SHA-1: 27048bd4ed3fa42fb4cbe871b0747ed1d751460e SHA-256: 8f55ed6fac8b62458792d749fef38f7d090a425ee3a0e6164be05c36aa8cde72
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, with the primary one being 'https://vilenefex.ru/aws?utm_term=edenpure+gen+2+filter', suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document. No scripts were extracted, but the presence of numerous suspicious URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/aws?utm_term=edenpure+gen+2+filter
    • http://lavkavkusa.store/cowpens_weather_reportidng9.pdf
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/84d396929ca.pdf
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/415cdbd.pdf
    • https://cdn.sqhk.co/tajiwikiter/QpIjjZo/pac_man_snake_game.pdf
    • https://cdn.sqhk.co/tokotuxajif/0jbMhdU/47228860939.pdf
    • https://cdn.sqhk.co/winudesuw/gjjdWo8/heart_s_medicine_hospital_heat_level_32.pdf
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/rukomimodet.pdf
    • http://wgathering.org/zobulebuknhzqd.pdf
    • https://binapesod.weebly.com/uploads/1/3/1/4/131438069/9460714.pdf
    • https://cdn.sqhk.co/rureroso/haFgcRc/4542529651.pdf
    • http://storeeuro.info/6980233971000arc.pdf
    • https://cdn.sqhk.co/dibirolinu/hbghdid/valgame_dios_pastori_letra.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiremefegonar/ussr_anthem_free.pdf
    • https://s3.amazonaws.com/welanisowari/jiligijalomemabaluri.pdf
    • https://uploads.strikinglycdn.com/files/d4b29c0a-4e41-4fb3-b3a3-296e6bba14da/serunegeg.pdf
    • https://uploads.strikinglycdn.com/files/8c236381-e019-46f4-b5a7-da85247a52ce/labox.pdf
    • https://uploads.strikinglycdn.com/files/22ba3609-ae8c-4026-a039-27686f455976/jowuvapo.pdf
    • https://s3.amazonaws.com/gujutavevive/building_technology_books.pdf
    • https://uploads.strikinglycdn.com/files/eaa22bd8-4c56-4776-a7bc-e38004d4e8f1/curse_of_the_high_iq_summary.pdf
    • https://s3.amazonaws.com/jumedemimo/biometric_fingerprint_reader_driver.pdf
    • https://s3.amazonaws.com/muvevanepen/aasld_guidelines_for_liver_cirrhosis.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_off0000f169.bin
f4fdf5d8e0fc8024115bb83fbeb843e992f90ecc36f69a0499a7c8824550dae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 4908 bytes
font_01_sfnt_off00010238.bin
28c22fadba1384402247f7b821df665c0536c20cf14538b355373c5c6d939f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 10876 bytes

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