Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aaa175e40281b8…

MALICIOUS

PDF

611.9 KB Created: 2021-04-21 03:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8145ee2d36913dc55db09af5f9249943 SHA-1: 8ef699310bdbd4e68d579ed9561d91cfe46c0110 SHA-256: 67aaa175e40281b8e89dbbfa2c1f13491cb140b277bc3125ba0a1238548f6629
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a heuristic firing for an invoice lure, suggesting it's designed to trick users into clicking malicious links. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely facilitates the download or execution of a secondary payload from one of the external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=ncdot+design+build+guidelines
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/2926199.pdf
    • https://jugafuxuxeg.weebly.com/uploads/1/3/2/7/132740719/2c4e4119b.pdf
    • http://monstergym.ru/lenadejitedizegin1bsnm.pdf
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdf
    • http://chategratis.online/dogedoreju1jttk.pdf
    • http://tricitysikhs.com/how_to_calculate_the_mean_and_median_from_a_frequency_tablem4o5d.pdf
    • https://dixelopenam.weebly.com/uploads/1/3/4/5/134590152/1929880.pdf
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/sabobade_kofovamaf_mabegubu.pdf
    • http://kalavar.xyz/diary_of_a_wimpy_kid_long_haulf2z2a.pdf
    • http://brosbass.com/how_to_fix_a_macbook_charger_that_wont_chargeogbcn.pdf
    • http://zumewidife.mygamesonline.org/99521004063.pdf
    • http://xibomupazone.mypressonline.com/xofuluxotasijakigi.pdf
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/bisateweko_zamefitegulif_reromowaboros.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mokisomalew.rf.gd/kulapadiburivokusolewo.pdf
    • http://sogivuwe.onlinewebshop.net/how_to_use_crackle_glaze_ceramic.pdf
    • http://deweperiji.epizy.com/luzozix.pdf
    • https://uploads.strikinglycdn.com/files/1cd55a8a-821c-4e8b-9117-cd399e866d1e/kojerubaruxelonop.pdf
    • http://wisigisovet.rf.gd/rewuzawovi.pdf
    • http://rolewafofe.epizy.com/25241247057.pdf
    • https://uploads.strikinglycdn.com/files/88e8c25c-4e5d-4100-a0e1-4fba40c37ab5/19714481218.pdf
    • https://uploads.strikinglycdn.com/files/ed67850c-8248-4160-8342-96d50c5f6503/dell_printer_v313_printhead_error.pdf
    • https://uploads.strikinglycdn.com/files/5eb81862-b424-4993-be8e-dfc329e4eab3/kaxisalidigu.pdf
    • http://kunivoji.epizy.com/tween_animations_android_examples.pdf
    • http://dujisuga.epizy.com/66937154987.pdf
    • http://zibevili.onlinewebshop.net/75295508326.pdf
    • http://vemireme.epizy.com/11637150300.pdf
    • http://sujomux.rf.gd/3650379510.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_off00093eee.bin
d02539ed70ca2eca71a021fdb3dd7b0430c2bfc7f6183854252cad963d5d6fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93EEE 4912 bytes
font_01_sfnt_off00094fca.bin
4cff33008e3e86a70365a576b583cf27c45d2f8e6dbb736e124c8ed73a6d1b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FCA 14220 bytes

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