Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5f60cdacdcf187…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 18:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 54f7f24692e4f161e459e03753926d21 SHA-1: 1336ae59ea382494b599f03ed0f7daa9752e6b74 SHA-256: 1f5f60cdacdcf187e5d9ec8863687098eb9c70bd9a955b429e1ade2c3095f3ba
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to exercises and PDF, likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=low+back+pain+exercises+for+seniors+pdf PDF link annotation
    • https://cdn.sqhk.co/xuzuvazol/Ahfnhjh/swag_girl_wallpaper_for_iphone.pdfIn PDF document text
    • http://watercart.ru/vedewerulorudukakuwuzomap75zb.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/6gcajdT/32474693766.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/jilVmTm/susetaxemeputewu.pdfIn PDF document text
    • http://janexik.22web.org/64239276272.pdfIn PDF document text
    • http://viwizuzul.iblogger.org/microelectronic_circuits_6th_edition_solution_manual.pdfIn PDF document text
    • http://sexedate69.site/petakenogoxajilekot4po5v.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/RDnrIKZ/bronze_age_comics_key_issues.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/underseat_storage_for_2020_toyota_tundra_crewmaxl1u80.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/bhjhgjg/vomijejevexum.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/ezhg4gr/artillery_shell_factorio_blueprint.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/JhgciUA/16770651791.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/-wxog1.pdfIn PDF document text
    • http://ashotik.space/50587243354gkz10.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/C0hi6iR/xidomeba.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/haSOyij/sticker_maker_machine_michaels.pdfIn PDF document text
    • http://nicepics.xyz/ratio_worksheet_grade_4pwemu.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/igfV8hb/ark_survival_evolved_xbox_one_cheats_artifacts.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/gggfjje/befolovil.pdfIn PDF document text
    • http://creditstar-kabinet.com/xukodapojirfj6v.pdfIn PDF document text
    • https://cdn.sqhk.co/fasegibuniz/sgfMTAe/game_bike_mayhem_free_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefadagisi.rf.gd/phospholipids_form_bilayer_in_water_because.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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 5420 bytes
SHA-256: c86c2c45233135ad370cc170d7739e3ea1b595a714b95c712c213782b92ab571
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 11656 bytes
SHA-256: 7f8c55c0cd5165183f474e3c317e8afa8af6e1f7ca1dde4697b015893c654151

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