Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4a2c7a16c77193…

MALICIOUS

PDF

65.2 KB Created: 2021-02-15 10:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 82242462224f78ee571eb40a2f38edcd SHA-1: c07291f8fbcb18ed8c94d6dfd08e6b8b998a4f9b SHA-256: 7a4a2c7a16c771937d010b7e4dda6b42d7fc29812ca101537cc6fb23217a9fbd
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://maypoin.ru/aws?utm_term=bush+baby+facts+and+information PDF link annotation
    • http://funogager.22web.org/tezerutevedumezor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_601d75f1555e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_6027310ca458d.pdfIn PDF document text
    • http://freshmind.net/sap_purchasing_training_manualvkc3d.pdfIn PDF document text
    • http://giocodigital.fun/shift_the_jelly_roll_race_quilt_sizefjr03.pdfIn PDF document text
    • http://vinnipoh.space/chrome_error_0xa04307212xc4x.pdfIn PDF document text
    • https://tumuzisokume.weebly.com/uploads/1/3/5/3/135351536/9675430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff931ae56fda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/football_strike_game_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/6261200000.pdfIn PDF document text
    • http://kesobikifa.epizy.com/xezigokepitilasesik.pdfIn PDF document text
    • http://wanalatuzukogax.epizy.com/25131945037.pdfIn PDF document text
    • http://rujugojokukasav.rf.gd/cosmopolite_3_answers.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/aashiqui_mein_teri_full_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/lubamutubuporimerovebapat.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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 5520 bytes
SHA-256: 986d7e41e5a48e295b98174ca8b18a1f0e9146268f7b36a3ab0c514d85efca39
font_01_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 10192 bytes
SHA-256: 3b6f291f52c43f6d84a4306e063f1bd0c137656a2915ce0997a81034ea1e8407

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