Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed7f23b2515b24f…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 09:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55393b618f2642f7d26f18d29efb8c84 SHA-1: d28d660debfe0f745c30a4f8828873c82ed8d6a8 SHA-256: aed7f23b2515b24ffc844afab466ab03642b7fac7b4c0abd8a211869bfcbe90b
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to a 'firemaking guide'. The presence of embedded URLs and the overall detection by multiple security tools indicate a phishing or malware distribution attempt.

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://vilenefex.ru/wix?keyword=firemaking+guide+osrs+theoatrix
    • http://sdfsdfsdf.shaketorch.com/ciclo_escolar_2020_a_2021_calendario_sep.pdf
    • https://cdn.sqhk.co/sevijeruba/shjhbhi/ball_vs_brick_games.pdf
    • https://cdn.sqhk.co/zenipijujate/jtWfhiG/83923958815.pdf
    • https://cdn-cms.f-static.net/uploads/4422137/normal_6034e2ad35997.pdf
    • http://gesemalisezusa.iblogger.org/numude.pdf
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5fffe22972a78.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/butebubutinajo_gesovalirigar.pdf
    • https://cdn.sqhk.co/metexemoraga/hjc7idC/63372480016.pdf
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/volaxaku.pdf
    • https://cdn-cms.f-static.net/uploads/4446019/normal_600ac7bfd8ead.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d591c853-f4c5-4af8-b05d-209519cf7dc1.filesusr.com/ugd/fc3b0b_83b0e4cbb430489cbc6218a354e42dda.pdf?index=true
    • http://tinijev.epizy.com/50562831489.pdf
    • http://fuvovidesom.epizy.com/36153724435.pdf
    • http://xewenofos.epizy.com/dushmano_ka_dushman_movie_480p.pdf
    • http://liviwofuxa.epizy.com/what_does_rcm_stand_for_in_maintenance.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_c510269e293947c19e745390dd25ffac.pdf?index=true
    • http://kijekamazeju.epizy.com/wakaxuzoxo.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_ff041856196446b3a81012063f9595de.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_off0000fad7.bin
70f3df0492aa506a955a0f1af3c42df9aa77b76a25185e08fc785b998bd36a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 5292 bytes
font_01_sfnt_off00010cb1.bin
24572c3da8231e840663661391f1e51cecc2de651db2225a2db8bc18eb896193
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 11280 bytes