Malicious PDF — malware analysis report

Static analysis result for SHA-256 854809a05f52d4ee…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 17:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c4a8ecbd4aaf66c0aa38dec50c64ec09 SHA-1: 7f9501f03e2ff00b539b145ab7656883365e0cb6 SHA-256: 854809a05f52d4ee68dfd3ef00835c8f2f92331f1974360a68ce137741560984
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to 'review answers' which likely serves as a lure to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=holt+biology+chapter+9+review+answers PDF link annotation
    • http://lishop.site/cyberpunk_2077_xbox_one_game_passp2qmu.pdfIn PDF document text
    • http://private-channel.site/belle_and_boo_egg_cuposj8f.pdfIn PDF document text
    • http://ottics.ru/12004072299xithb.pdfIn PDF document text
    • http://wersita.fun/824471431174yyyn.pdfIn PDF document text
    • http://bhd-management.space/tesasivodevujewavavesifxkos.pdfIn PDF document text
    • http://dukipor.iblogger.org/laruwodomeromat.pdfIn PDF document text
    • http://hesap-al-sat.com/38462412938hyk35.pdfIn PDF document text
    • http://bigchance.pw/tijawapetebv874j.pdfIn PDF document text
    • http://krym.today/4124699226805v9t.pdfIn PDF document text
    • http://merishwheelrecords.com/8733092303zvt52.pdfIn PDF document text
    • http://pl50off.info/kuginorogutrsqfl.pdfIn PDF document text
    • http://ionatr.space/65994744818zs2ps.pdfIn PDF document text
    • http://proita.space/battle_strike_mobile_fps_game_download_apk2zv45.pdfIn PDF document text
    • http://unityfree.xyz/56827635509q4l3r.pdfIn PDF document text
    • http://guwusovonolus.iblogger.org/61335065821.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/menodedibomuka.pdfIn PDF document text
    • http://opit.space/2020_nfl_fantasy_football_mock_draft_pprhl3he.pdfIn PDF document text
    • http://ttttrrrr.space/format_sql_server_management_studiouxk3z.pdfIn PDF document text
    • http://4kuhd.me/roadmaster_24_inch_granite_peak_mountain_bike_white6kdyj.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/fee125a5-fc91-4150-b187-97f3893f3364/dakexazafomezudixopit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a686fa72-1bb8-4573-94ef-a013f59e6d06/craftsman_29cc_edger_blade_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b7cf45-d235-4706-ac05-8d26b498a8ab/38092281290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fac8d6-baa1-415a-936f-258dcd8644b8/59745907694.pdfIn PDF document text
    • http://jodolevuvik.epizy.com/is_microlife_blood_pressure_monitor_accurate.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5704 bytes
SHA-256: 683bda25ff695cb90ef3b0731b10f0e2c7d6e37b715fffc4c88d4e07d0a9deb5
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 14028 bytes
SHA-256: 7927815da2e10fd70cdf2bf02453d4cb0671c70d851bfe684729818be41536db

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