Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a44eded07e46fc…

MALICIOUS

PDF

114.4 KB Created: 2021-04-18 11:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c249fe8728407b8a43d01b4192526149 SHA-1: ea74401898ae3b31a0447b8f1a02eccafbcea688 SHA-256: 77a44eded07e46fc210db343fb2e82f08ec2110ff39c508d458d23c5a66e33e8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and the document body, though partially corrupted, suggests a lure related to 'survival games unblocked online at school'. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=survival+games+unblocked+online+at+school PDF link annotation
    • http://mojipepofakakoj.22web.org/fodezusotitenofizejiman.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/nipirisepidi.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/58568359679.pdfIn PDF document text
    • http://mamuxorap.getenjoyment.net/welilikefejowefobelozul.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/kumipakatikapux.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/the_history_of_cancer_epigenetics.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/95231447237.pdfIn PDF document text
    • http://woronari.getenjoyment.net/16617464353.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/brothers_grimm_biography.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vokesakogo.onlinewebshop.net/where_can_i_watch_jack_reacher_never_go_back.pdfIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_9a3794266782475590626fe101b78ac8.pdf?index=trueIn PDF document text
    • http://jowokepo.atwebpages.com/brunelleschi_s_dome_how_a_renaissance_genius_reinvented_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f804a64e-8f47-4e89-9263-ebf1000c8171/how_do_you_program_a_craftsman_garage_door_opener_keyless_entry_pad.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_93c673ae411248ca9e0424e4acc81568.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_9c22e74dc20e4e65b838bac448c4ce31.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_4f32b79cffa9416783b72f67c9ebe3a5.pdf?index=trueIn PDF document text
    • http://lamoren.rf.gd/free_budgeting_planner.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_2c45a34e7b2c40c68df39be1f4c5a6da.pdf?index=trueIn PDF document text
    • https://e5acd528-9925-4355-98ed-6c6122c9c19a.filesusr.com/ugd/49fecd_a71e4424747641c7bbd13b00736603ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f89bb9d-f416-4e7e-8785-032b3abe3c4b/wixekosetakomolujalu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E1 5600 bytes
SHA-256: 9b06df340faa4342e1415b547fe6da09e2a4036e786e7351dddf71cdb18e5c8e
font_01_sfnt_off000184b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184B5 11972 bytes
SHA-256: 66b2dce011fec14f983be714f425a47f4e097f022f8ff0ea1b5501d46e542d5e
font_02_sfnt_off0001ad83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD83 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e