Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef20ba7760be5d27…

MALICIOUS

PDF

84.8 KB Created: 2021-03-06 04:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 712d1ea3c4c84533657edfb95ca8fa6e SHA-1: 7c194bb7175135fa4544b852535f528a320172e3 SHA-256: ef20ba7760be5d2772c924626b30ab4989938acb7d8be9420941de55cc30b902
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URIs pointing to external websites, with at least one identified as a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=how+to+stack+a+kenmore+front+load+washer+and+dryer PDF link annotation
    • http://yesstore.pro/81256484874zuf5.pdfIn PDF document text
    • http://onsideball.info/what_order_do_you_watch_divergentoeic8.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/A8hijhb/ultimate_dinosaur_simulator_mod_all_dinosaurs.pdfIn PDF document text
    • http://alcozerox.com/walmart_job_application_form_canada8p71v.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/7776993.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/sibujafa.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/fhgnS8M/gafufizokegosafubizakom.pdfIn PDF document text
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/bidopusuwededidasejo.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/rozapuji.pdfIn PDF document text
    • https://cdn.sqhk.co/pugijuzo/hKgcja5/minecraft_how_to_use_hopper_minecart.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/ahiqicz/etisalat_business_online_contact_number.pdfIn PDF document text
    • http://xarapen.22web.org/mitofubumepexaxirizub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/what_is_a_civil_process.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/cheat_minecraft_beta_android_bahasa_indonesia.pdfIn PDF document text
    • http://ramufezumax.rf.gd/xufasifirutenononab.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/ge_potscrubber_980_dishwasher_dimensions.pdfIn PDF document text
    • http://zuvidetalenaras.epizy.com/wellness_recovery_action_plan_template.pdfIn PDF document text
    • http://zuputes.atwebpages.com/69289013675.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/betterley_report_cyber.pdfIn PDF document text
    • http://dilalixurapa.epizy.com/39418805400.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/google_analytics_reports_include_everything_except_what.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 5480 bytes
SHA-256: 9aec831f9ecde0380acef4109a20721b622e70d31b8f767117b96420c72d0d1f
font_01_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 11604 bytes
SHA-256: 326cf136e2ff4124a3254299cd1111592512b3a5448b7aaa6e8b639dc4c76669
font_02_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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