Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f08c83e329e363…

MALICIOUS

PDF

88.0 KB Created: 2021-03-14 20:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 394a123f224876fcc84b77c50f72fd94 SHA-1: 8f0cd8cc7857c2fb5931dd98758f36a2edc83931 SHA-256: 85f08c83e329e36317f6285f1fe3956c147ed0bea91c77e22e5e8883182700c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=aztec+mini-dbq+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/felolavap/sicO738/name_this_song_siri.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxogugexi/iia4BCV/inochi_no_name_piano_sheet.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/f5e3ef4622.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/ehcqjaB/timajara.pdfIn PDF document text
    • http://vabakavolageni.22web.org/inclined_plane_worksheet_answers.pdfIn PDF document text
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/9411216.pdfIn PDF document text
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/xekanebaxet-lejunekuzuroji-doduga.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/hghhcjA/mepenawet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femolejo.epizy.com/chess_game_setup_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0624cc20-895c-4ed0-8680-8b31a8ed462b/dantes_inferno_an_animated_epic_movie_download.pdfIn PDF document text
    • http://filutapokupa.epizy.com/zudorukumegekofidowobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e30cc0-6cac-444d-9363-bebe666cd501/jemizakedobisemutaxalif.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/how_to_create_website_using_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/28335426201.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/que_es_el_modelo_psicosocial.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/squat_university_squat_form.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/83238375998.pdfIn PDF document text
    • http://semazixiguf.rf.gd/75025433126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9444f5-d800-425f-872c-44e095d199fe/titus_andronicus_quotes_about_lavinia.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 5640 bytes
SHA-256: 12c8ba25e01b6968b788cd9c42968fc9030088d510c0db73d3aca02c3bb955db
font_01_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 11936 bytes
SHA-256: 58ad96541885b180e94b8cb5d0805c61571f20e3fe0d46bdc795ad8e54165457

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