Malicious PDF — malware analysis report

Static analysis result for SHA-256 d761b74b413427c9…

MALICIOUS

PDF

71.2 KB Created: 2021-03-30 08:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec73cfc8768371c6f16a3b73825d86b6 SHA-1: d1f7997d27ae6b662eab208a711f76e531150e43 SHA-256: d761b74b413427c90d6acde83d354625eafa41507d5065ce58aa3d592ca2b06b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a URL that mimics a search result for a free book download, a common lure for phishing attacks. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create deceptive documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=monster+kody+book+pdf+free+download
    • https://cdn.sqhk.co/metexemoraga/jbWY3kS/11605010375.pdf
    • https://cdn.sqhk.co/nukusigemug/jjdgd2Y/aarp_medicare_advantage_walgreens_ppo.pdf
    • https://cdn.sqhk.co/kogewole/heViiBz/download_zombie_catchers_mod_apk_2020.pdf
    • https://cdn.sqhk.co/pafatewodoju/h40hboF/73830161585.pdf
    • https://cdn.sqhk.co/tewokozogop/RZKWigk/how_to_make_origami_animals_with_sticky_notes.pdf
    • http://pefiworawodud.mypressonline.com/16953863896.pdf
    • http://nuxuxavolas.22web.org/70192977987.pdf
    • https://cdn.sqhk.co/lepowabog/Yigjbjc/51637622549.pdf
    • https://cdn.sqhk.co/pugalaleluti/XSahghc/barber_shop_near_me_walk_ins.pdf
    • https://cdn.sqhk.co/tozijizubu/hfABNge/12306869599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bikaduwixunu.epizy.com/gefagupifulin.pdf
    • http://loserelosov.rf.gd/career_opportunities_in_biotechnology_and_drug_development_download.pdf
    • https://uploads.strikinglycdn.com/files/b2fac4b2-df2d-446c-a970-c5d8f61b9612/adobe_premiere_pro_cc_2017.pdf
    • http://wawefib.rf.gd/rudoxevopideladosaku.pdf
    • http://rigevigikeso.rf.gd/creo_parametric_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/bff407cf-20fe-4b47-a011-2cc0d0a45045/pipe_fitters_near_me.pdf
    • http://fazegujopazoj.atwebpages.com/42505171025.pdf
    • http://xifimerin.onlinewebshop.net/hannah_arendt_the_origins_of_totalitarianism.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_off0000d730.bin
71bb55eec35da630cffafb734e82b38cbfab9c70f919ce8d62461cd44e2490ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 5436 bytes
font_01_sfnt_off0000e9d5.bin
89a73a94dc0b25a3e173fdcd7474ba05f00e5f0cc7c8113dd6f6290c1a07e126
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 11044 bytes