Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e43a52d8d72812…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 15:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de1bc44762d1e1ed666adcc73e5b89cf SHA-1: 574d64e276ab3a4682076a31e9942ff901d75f01 SHA-256: 85e43a52d8d728127fca677e6f201e83add51d750d23379fda9a74d71ac19295
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=fundamentals+of+computer+graphics+pdf+download PDF link annotation
    • http://dimax-matrasy.ru/9823518904cv3ih.pdfIn PDF document text
    • http://zoosalon.org/how_to_replace_black_and_decker_dustbuster_batteryx9f1k.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/vevasilugupirskxs.pdfIn PDF document text
    • http://shmelev.pro/what_is_the_best_stock_watch_appc5kl1.pdfIn PDF document text
    • http://chebsvet.ru/pajevikufoxizoz3zwa.pdfIn PDF document text
    • http://sazaxizixukuju.iblogger.org/employees_provident_fund_form_19.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/ligoguladitufipumxzm.pdfIn PDF document text
    • http://detonic-ordina.website/steel_sickle_conan_exilesnu2bi.pdfIn PDF document text
    • http://khareedforosh.com/mesimafisepobumofoga51u3k.pdfIn PDF document text
    • http://gmetry.online/pigapadeworokubilzog.pdfIn PDF document text
    • http://hellesypakk.online/what_was_the_number_one_song_in_20170li3a.pdfIn PDF document text
    • http://reactivaperu-2020.com/manual_123d_design_espaolgp9yf.pdfIn PDF document text
    • http://nashremont.site/88412646695qwuhr.pdfIn PDF document text
    • http://instasurprise.online/sewasujoejxws.pdfIn PDF document text
    • http://aycotoro7.xyz/can_cardboard_be_stored_in_flammable_cabinets78c47.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/41934432713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6442c1-66a8-438b-93c0-f15f6d2c33bf/27988925225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7590419c-8052-421f-bff6-97f447ac77b6/42449991834.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/allison_1000_transmission_parts_catalog.pdfIn PDF document text
    • http://jesotumab.rf.gd/cellular_biophysics_weiss.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5616 bytes
SHA-256: 176112cfc0e623a773b6f099c24b604e100b993006e5f4b300cd3603c33caca0
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 11100 bytes
SHA-256: 090e67ba40dbbe88bb4f1a067ca7e9fade90334382f5c2bfc0fc655c94fc5dd5

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