Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f51723f1947f39…

MALICIOUS

PDF

76.6 KB Created: 2021-05-11 17:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d5da563a80487b8c7e978dae4e5355ca SHA-1: e66928b6bff5cb2dcf252893b2ceb66510dd964d SHA-256: 64f51723f1947f39f95e2129f922f35bd71aa5b2bc2c7622a9df8b08fb5bbf77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=how+to+find+the+half+life+of+a+reaction PDF link annotation
    • http://yatvoyya.fun/3505188386832828.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/iOt6Rgi/suxexofubovuse.pdfIn PDF document text
    • https://cdn.sqhk.co/mipemoku/zigjdqC/american_english_ipa_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/gfhbbih/joxobigidudiku.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/7s8ULqM/arcade_games_king_of_emulators.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/XieijEv/falling_ball_viscometer_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/jjhaXdL/fun_road_trip_activities_for_adults.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdfIn PDF document text
    • http://nipobudagese.mypressonline.com/how_to_rearrange_pages_in_adobe_acrobat_reader_dc.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/WHIjfOZ/coffee_cake_recipes_using_buttermilk.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/zanifazuposunum.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/ihajjja/kodomoziri.pdfIn PDF document text
    • http://indital.fun/86269173199grta4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujofikebevalaj.rf.gd/encyclopedie_des_plantes_magiques.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/30616576262.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/85202896932.pdfIn PDF document text
    • http://sarijuwowu.rf.gd/what_are_the_tools_used_in_data_analysis.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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 4984 bytes
SHA-256: 8acb1f800b90075d778a9c92358874b18a046c83172b6c1a2b77b6db531f7583
font_01_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 11776 bytes
SHA-256: a5f876720e0a1435800984866aa4b4f7c3f3b767823700a07c4c8930591ffcd1