Malicious PDF — malware analysis report

Static analysis result for SHA-256 31abeda1880ad3f5…

MALICIOUS

PDF

67.3 KB Created: 2021-06-05 02:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a9442f99e62e2e54ec448b9a3393064 SHA-1: df830ec535c62d9da5f772de7cb729b66fa427b5 SHA-256: 31abeda1880ad3f513c826bdbccd95bb5a377251fc7b4818b7299683ac139be2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://huntic.ru/pbw?utm_term=how+to+do+tricks+on+a+skateboard+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491450/normal_60586be8daa05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_6037a2f5ec9a2.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/pawulugo.pdfIn PDF document text
    • https://selijexobava.weebly.com/uploads/1/3/1/8/131856120/1220865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_6000d22a7c9f0.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/3a1ca1f91e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_6048fd2bab589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_6002bc6c77e78.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/zutalevevejidog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowujepojez.pbworks.com/f/limiting_reactant_worksheet_honors_chemistry_stoichiometry_6_answer_key.pdfIn PDF document text
    • http://muxopal.pbworks.com/f/brawl_stars_mod_apk_v_14._118_download.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/mogonegipilotekuxabirowi.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/f/toshiba_smart_tv_have_bluetooth.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144524319/peaceful_warrior_full_movie_in_hindi_dubbed_free_download_worldfree4u.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/f/solving_equations_by_taking_square_roots_worksheet_answers_lesson_22-1.pdfIn PDF document text
    • http://marutipug.pbworks.com/w/file/fetch/144421368/bleach_brave_souls_hack_android.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144500982/lekopamejiv.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/kevelanexobaxijosumul.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_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 5332 bytes
SHA-256: 8dab51b2ac2d2f4419688d670c19b28ce507b79805cebb1d13594b38d756a728
font_01_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10264 bytes
SHA-256: 20966e6a995dfbb63a7c463254586e5e677b7f448a80fa19a8c6a73436723318

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