Malicious PDF — malware analysis report

Static analysis result for SHA-256 7621a2236fd8652b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 22:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 864615820690f2d777e043c60f56cef3 SHA-1: 95dc14b89e0fe2a4ba0aa9959c94eaf5838fa836 SHA-256: 7621a2236fd8652b4ebfd2f81963ad33197fcfd1a0b3f96fa3823c4618612c1a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, 'xezojetit.ru', which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'vacation leave', a common theme in phishing campaigns.

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://xezojetit.ru/123?utm_term=cerere+tip+concediu+de+odihna+pdf
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/lilawa.pdf
    • https://kopabiziruzoxol.weebly.com/uploads/1/3/1/4/131406592/291716.pdf
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/2664071.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/f0a15bb.pdf
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/8620454.pdf
    • https://static.s123-cdn-static.com/uploads/4418191/normal_6007607678318.pdf
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/vosebelakeduwo_papojiw_tawujeri_lebugibolajuje.pdf
    • https://cdn-cms.f-static.net/uploads/4454971/normal_603c04a7d8b8d.pdf
    • https://ramowofotaro.weebly.com/uploads/1/3/1/6/131607053/vuwiwujosaniwogejo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8cdd010-a203-4d19-a3bd-97863321ae42/educational_psychology_master_uk.pdf
    • https://uploads.strikinglycdn.com/files/1378fce5-2a23-416a-8a2c-ea4afa6f5bd8/animal_farm_napoleon_quotes_about_snowball.pdf
    • https://uploads.strikinglycdn.com/files/66c81f41-23e8-45c1-9a81-17114f14e81b/67241903006.pdf
    • https://s3.amazonaws.com/zowibatev/formato_carta_compromiso_de_adopcion_de_mascotas.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/android_assets_file_not_found_exception.pdf
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_402e0b55c26d453b8d6024bd914badd7.pdf?index=true
    • https://s3.amazonaws.com/bisazabe/radaxifavonamab.pdf
    • https://uploads.strikinglycdn.com/files/b4df9363-af72-4cc6-b19a-c9211da6c592/femeta.pdf
    • https://uploads.strikinglycdn.com/files/d62a42b5-9edc-45bd-81b0-27444c5addae/30698538930.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_70ff555a5f07489fb19f45d86e6beba5.pdf?index=true
    • https://s3.amazonaws.com/jidosatikim/artifex_ghostscript_9._25.pdf
    • https://s3.amazonaws.com/fukepez/71069229887.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_off0000f009.bin
1fd476128d9f5f86e59c59c9c61d764ce7c0591863e7cb5e9c7e5106457d8081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 4940 bytes
font_01_sfnt_off000100cf.bin
85635343e812aa39e5330a1a45d0c9bda0449650904f4e7b8b109fcc3f931f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11912 bytes

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