Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bf9fad92aeed90…

MALICIOUS

PDF

72.7 KB Created: 2021-02-21 04:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7b0f27f2608f6cc485592d9f0eefed8 SHA-1: 3936e95e24b569b7141a28b1abb299ef78e22e11 SHA-256: 43bf9fad92aeed90889f71122b2fcdc112df8011ab8e191b5c1c47e157828f0d
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://bologen.ru/strik?utm_term=pathfinder+2nd+edition+advanced+player%2527s+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/kinanekoxo/O4EYhfU/love_test_online_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6010fe87dffc3.pdfIn PDF document text
    • http://stopro.store/16457463453t4av.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5feee5236b52e.pdfIn PDF document text
    • http://pukutabutosu.22web.org/15934151739.pdfIn PDF document text
    • http://quickpapp.online/69076380843oz2go.pdfIn PDF document text
    • http://kieverts.xyz/jovofawiwesujulevezolajahbp50.pdfIn PDF document text
    • http://lg-copyright.com/arabic_novels_with_english_translation9r345.pdfIn PDF document text
    • http://roflan.site/zombie_shooting_game_for_pcw10ut.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/7gjHihd/t_i_knives_crash_hack_ios.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/spin_the_bottle_game_unblockedqchfh.pdfIn PDF document text
    • http://afracheat1.xyz/how_to_get_rust_off_grill_gratesg9zzk.pdfIn PDF document text
    • http://muziwavesos.iblogger.org/calcium_metabolism_in_dentistry.pdfIn PDF document text
    • http://evilcheats.fun/gojidawewofov4f6u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxasosopu.epizy.com/2496276404.pdfIn PDF document text
    • http://digotadegijo.epizy.com/bmw_318i_auto_to_manual_conversion.pdfIn PDF document text
    • http://poxobigijeteri.rf.gd/59342574612.pdfIn PDF document text
    • http://waverotefiwob.epizy.com/61402852797.pdfIn PDF document text
    • http://mobopufo.rf.gd/canon_digital_photo_professional_4._8_manual.pdfIn PDF document text
    • http://dowexibagodi.epizy.com/surewiw.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 5748 bytes
SHA-256: b00ba300f508fc391a43a1c32d9df140cc2dcf3d387d239d41486fe2f3e211f4
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10172 bytes
SHA-256: 6e0b02112817108323d8f606dfb801f7519f4c47b789e6fd518299b010d324e6

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