Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a90c9ca233fa526…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 04:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be8b486243946be5a729af8cc99edd0f SHA-1: 7c9b183703e2867b7fc875e777ae70f3db48f59c SHA-256: 9a90c9ca233fa526e53e7bd301bf4a6a6e257c3c0478e3b5f968ee37b45a4d1b
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. A heuristic also identified an external URI pointing to a suspicious domain. The document body, though heavily obfuscated, contains metadata related to PDF formulation and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The presence of an embedded URL indicates an attempt to redirect the user to a potentially malicious site.

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://pelibifir.ru/award?keyword=aloe+vera+skin+gel+pdf+formulation
    • https://cdn.sqhk.co/lonuxonemor/iRaUQgi/lenototevuwijejug.pdf
    • http://kulenoba.iblogger.org/fasijodaposulemuzudobod.pdf
    • http://podarokinsta.site/piano_chord_progression_formulasqskng.pdf
    • https://cdn.sqhk.co/lubigegek/rCOjbtB/registro_de_brasfoot_2019_gratis.pdf
    • https://cdn.sqhk.co/xugosovemi/dlcvMhf/vofisuzidunejadedifa.pdf
    • https://cdn.sqhk.co/tajudozizif/cDicida/wood_carving_simulator_3d_mod_apk.pdf
    • http://itdiscounts.pro/xesotigirixozarezaganasubq7eb4.pdf
    • http://albatros-trans.ru/989229318730p52w.pdf
    • http://like-store.site/xagutodibafesilenulriyax.pdf
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/jaruxewexo.pdf
    • http://dommasters.site/60033859487ky0nq.pdf
    • https://luvidobanuneje.weebly.com/uploads/1/3/1/6/131606009/489502.pdf
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/xujurogosinolul.pdf
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/ea4a5045.pdf
    • http://livecopyrightverification.com/928003893319s6st.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://semazixiguf.rf.gd/photoshop_templates_for_resume_free.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_799925147b8844dabfa0f1012bdb5ab2.pdf?index=true
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_da6b69634d0b4f17a3cdf237883b872d.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_120f056423c34849afdd83b7fe4082c6.pdf?index=true
    • http://sejofedavija.epizy.com/72469897392.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_9e6c45805f0f44c2b2d0ed1974b6c6ca.pdf?index=true
    • 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_off0000eb45.bin
4b8039a4b765e895c9505f7cec93bb8f2226fa9117536a5705c5a709be40343b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5472 bytes
font_01_sfnt_off0000fdd9.bin
db00f44281d1442c807f485a2c166c7556dd0aa3470224812bffc41b848075c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 11108 bytes