Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c0f103a045859b…

MALICIOUS

PDF

78.2 KB Created: 2021-06-06 01:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b0babe6855540a988cd9da26920ca9d7 SHA-1: 1f3dd0bd3c17b1681e47bd0d971edbee785b343e SHA-256: 23c0f103a045859b5ccba807bab294b0fdf0e445eec349fdcbc5cc9b0a1588fc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=acceptance+of+job+offer+letter+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5fef99cf36b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_604e361079ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fda5f586aeef.pdfIn PDF document text
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/rexewudivokilor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_6061cbc927dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381962/normal_5ff1070f585b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6021098b65fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_602ffc4e9b31d.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/5d6b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_605d73ee304b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5fda46d346a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_6018c1fa5b0d9.pdfIn PDF document text
    • https://lojijuzirikoza.weebly.com/uploads/1/3/4/5/134593465/barovodogotakif-xopol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5feb0bdc647ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fcd66127ac01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_6018488e6ea9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarogifere.pbworks.com/f/amar_o_depender.pdfIn PDF document text
    • http://mujiwareneje.pbworks.com/f/dls_21_unlimited_money_profile.dat.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/download_game_efootball_pes_2020_mod_apk_offline.pdfIn PDF document text
    • http://xemademeku.pbworks.com/f/28567950937.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421746/51974080943.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/pebekiwi.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144425265/dd_ship_map_maker.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_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 5188 bytes
SHA-256: f84320df80f8770aafd7796b1f54420eeca233880162c5cc9203ce64eb8d9d7d
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 11076 bytes
SHA-256: 9b566cecc48a1c356ca8c69996ad3678e741e3e5cbdf8d6dc12582c3db45f0ae

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