Malicious PDF — malware analysis report

Static analysis result for SHA-256 028e26e35778ebde…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 21:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e19078cda94383d60713971279f3dd83 SHA-1: 5b72e0c09763defb34ff95565327c54d84c4b2dd SHA-256: 028e26e35778ebde18bbe4d6ad53bc1b5b929ee242108f02a74f50bfe6f1fc61
186 Risk Score

Malware Insights

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

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 0.9991

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://ponafet.ru/award?keyword=gastroparesis+diet+pdf PDF link annotation
    • https://cdn.sqhk.co/wadusazilox/DsHhh3V/optical_illusion_hypnosis.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/wjhC8ic/xibuwetuvesid.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/ZOJKMjc/rayman_jungle_run_mod_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/ghUc7hd/fugejupuzinurube.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/Ijejfha/platypus_evolution_crazy_mutant_duck_game_schedule.pdfIn PDF document text
    • http://my-favshopc.online/king_lear_summary_act_4_scene_63zt7u.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/Ehh5jgI/snap_energy_assistance_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/8jhihjh/bomob.pdfIn PDF document text
    • http://yoga-fitness.space/87219041687wjzfd.pdfIn PDF document text
    • http://varistop.site/wupobqoe1r.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/lbrichi/clash_of_clans_hacked_server_apk.pdfIn PDF document text
    • http://zuvixomajav.22web.org/zoxunukajapas.pdfIn PDF document text
    • https://cdn.sqhk.co/tuturuno/rziaY9d/ten_pin_bowling_balls_for_sale_near_me.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/ticTgj7/unnatural_selection_osrs_best_tasks.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/FSEidha/51520962774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livodubudo.rf.gd/assemblers_and_loaders.pdfIn PDF document text
    • http://xulisaj.rf.gd/genetics_reading_comprehension_worksheet.pdfIn PDF document text
    • http://lixoxomowaxane.epizy.com/vocabulary_for_ielts_audio.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_3273513851c84f738e6c33c981fb855b.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_7cd1e51eb2764050946c3e5e178e51b5.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_3392f79aabdd4e708a262fc8028ac277.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_31fc775172f4427a80d82b4818876267.pdf?index=trueIn PDF document text
    • http://rokodejufoda.rf.gd/7187703884.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_e7998cef146f48a3a570c26f5d1974f9.pdf?index=trueIn 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_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 5036 bytes
SHA-256: c3b3ed3324b7e493aea7ae85d35805c948437d506107904c9e304f8aa76d94ff
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 11268 bytes
SHA-256: a0828aab73d1643aa64fafee91b39ae868bb32baecc369cb34fe2a039193479d