Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb5f66fe09a5ca7…

MALICIOUS

PDF

84.8 KB Created: 2021-05-04 03:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b0e92bb176211c689a6c31ed06c77ab2 SHA-1: 65f8b693d1877dc97c6bd18bc95804eea2a1d741 SHA-256: 0cb5f66fe09a5ca7191d586008fd5077dcdacc4d181ce7283169250f1a1b544a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=at+what+age+is+the+human+male+brain+fully+developed PDF link annotation
    • https://cdn.sqhk.co/lunilageruvu/bhfgGhg/10391738843.pdfIn PDF document text
    • http://in-arenas.com/26717595584emhml.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/troy-bilt_9_in._140cc_gas_lawn_edger_trencher_25b-55ma766.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/oracle_autonomous_database.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/5A2DEgh/bidyalay_parent_teacher_communication_school_application_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/3hjKijY/paypal_customer_service_telephone_number_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/6VihjiV/xitizad.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/ififjau/vlc_media_player_android_app_free.pdfIn PDF document text
    • http://arm-watch3.club/2463599089219xb9.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/realidades_2_capitulo_6a-_4_answers5wgnv.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/gehe03t/juzuzekazatonum.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/rqmZUhe/74478863558.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/repemimavozitu.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/gdPCjgJ/37137603256.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/ebjgib5/babikelagalanebelupikofus.pdfIn PDF document text
    • http://es50off.pro/pobaxemefozukiralopitiburkvkt1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_32323723b2c8418cafc13f64d202bc15.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_a127fec7981247209012e30bd4df743b.pdf?index=trueIn PDF document text
    • http://gisaxuzarufol.epizy.com/southern_and_northern_hybridization.pdfIn PDF document text
    • http://fiwazabon.rf.gd/99852049211.pdfIn PDF document text
    • http://sewegijod.rf.gd/90452591301.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/types_of_antidotes.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/xukobepotuvazipa.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_34f165a70e7e401ea634e598b44af432.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_cc578e8cfd494343b288c3d06e4af4a7.pdf?index=trueIn PDF document text
    • http://natexaz.rf.gd/15653927813.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_15ae9af053a94edf80d4659e8221f00f.pdf?index=trueIn PDF document text
    • http://madukesizor.epizy.com/morfologi_rotifera.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_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 5840 bytes
SHA-256: 9de1e28d03a7c0ada0495f667b6e0f061aa97fadfff107452f67ad084b9843b1
font_01_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 11024 bytes
SHA-256: 104295d647932416d04e97cd088339227b7f60c71881909ce723f2de838f7882

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