Malicious PDF — malware analysis report

Static analysis result for SHA-256 1964731fa4bd34c9…

MALICIOUS

PDF

75.8 KB Created: 2021-03-03 08:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e0de864dbed9e2998d669cf30a36026d SHA-1: d1d21881e8f6e8c72148dd0542116b706580a730 SHA-256: 1964731fa4bd34c990c0d884e07149a89a7d8da9ed3459851ce2be726cd8d722
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to numerous external websites, one of which is associated with a phishing lure. The embedded URLs and the PDF's structure point towards an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=suspense+romance+novels+for+young+adults PDF link annotation
    • http://powajaxib.medianewsonline.com/why_does_my_big_buddy_heater_keep_shutting_off.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/how_to_name_your_best_friend_on_snapchat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_60355ff46ae15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_600e5191b7806.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/11725791070.pdfIn PDF document text
    • http://zoluvukabufe.iblogger.org/27441234842.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/jatizoxeliwakuzipi.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/9qZqtqB/hexagonal_prism_net.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/zugurab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5ffc1e51258d4.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/fheNThi/72442979893.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/minn_kota_trolling_motor_plug__receptacle.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/22874745611.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/jgiajji/online_multiplayer_games_with_friends_browser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukigopi.rf.gd/movimiento_circular_uniforme_conceptos_basicos.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/autocad_jobs_work_from_home_philippines.pdfIn PDF document text
    • http://novepajosebuji.rf.gd/rubojeropurusonefaxup.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/how_to_do_apqp.pdfIn PDF document text
    • http://nawonuzegajosi.epizy.com/42661350180.pdfIn PDF document text
    • http://tofetakipumax.rf.gd/besofifimufud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 5740 bytes
SHA-256: ee27c277f0ff7694c4de46740609d86859920b28f173b2c554596cc86fda1323
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10900 bytes
SHA-256: 36e3b75b395bd9eeb69803162ce77e8c8b3f5d345f8ddbcb484285a439fdb743

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