Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d4deaf2a0bfd11…

MALICIOUS

PDF

89.4 KB Created: 2021-03-30 01:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 29481dde2fdb5c05d95956716a1e3bf4 SHA-1: 974237c04e1be04078ef65ef5a3002bec8775ebb SHA-256: 72d4deaf2a0bfd1145af569f9e6b33bdb4548d91ae4d76a90cb8c80114aad8f0
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 0.9997

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://mezovuduw.ru/strik?utm_term=company+of+heroes+2+master+collection+trainer+4.0.0 PDF link annotation
    • https://cdn.sqhk.co/xederebat/fxgdij7/37954583146.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/gfjjijB/werepewamoxavolojipat.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/jcan5ig/cold_spot_on_my_skin.pdfIn PDF document text
    • http://remastacer.com/fufozewilokujp22i7.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/jiS2hin/lip_art_3d_satisfying_lipstick_tattoo_art_games.pdfIn PDF document text
    • http://cmbespaceclient.xyz/zekozamhaww.pdfIn PDF document text
    • http://heartcenteredequestrian.com/film_basara_season_4_sub_indo5xafj.pdfIn PDF document text
    • http://nufarelarapo.iblogger.org/facebook_video_er_site.pdfIn PDF document text
    • https://cdn.sqhk.co/gexojavo/PjdzhiC/lexivariwaxojusadixaju.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/angaaray_book.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/ygegcig/koeman_free_kick_champions_league.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/the_first_world_war_a_concise_global_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibagog.onlinewebshop.net/thematic_apperception_test_tat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6f8650-5969-47da-b032-3dff7ffc8b27/ancient_greece_things_to_make.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/nanomaterials_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fcd1a2-d444-469d-a422-96f00b023e7e/evenflo_chase_harnessed_booster_install.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/60558504302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb76ae74-b55e-4c6b-9dd9-24e2b5d8e026/15915258280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc62b7c-1f6b-4f90-97c7-fe983b364323/defibanojireripez.pdfIn PDF document text
    • http://tujatubaniza.epizy.com/mentoring_partnership_agreement_template.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_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 5656 bytes
SHA-256: ad084c65b492e16f449546b7415dad8cbe986dde473bb20300b29456fbfefa25
font_01_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 12844 bytes
SHA-256: 0d8d3baad9c64e00805f8758a46394524bb13b2ec4394f3d21b9557b1f8caea6
font_02_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67