Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe81d249a857c55c…

MALICIOUS

PDF

85.0 KB Created: 2021-03-19 19:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ff0bbe5c7ea94f48fde2371e73f41562 SHA-1: 57e5b6d446619a171869cb13c44c87737f24dd32 SHA-256: fe81d249a857c55cb97a6e726387cae4e4b2c1862cf389034d33028d54056594
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://vilenefex.ru/123?utm_term=api+specification+document+template PDF link annotation
    • https://cdn.sqhk.co/kojagopomon/g8DR6ji/tamil_bible_free.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/operations_and_supply_chain_management_for_mbas_6th_edition.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/best_self_intro.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8hNQvdq/hangout_with_yoo_lee_hyori_jeju.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/Kl2yiij/flight_sim_2018_android_gameplay.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/ashrae_handbook_free_download.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/zesiwavamadejuji.pdfIn PDF document text
    • http://maxonona.22web.org/internal_combustion_engine_schematic_diagram.pdfIn PDF document text
    • https://tupefumezamubew.weebly.com/uploads/1/3/0/8/130874634/7667046.pdfIn PDF document text
    • http://kefisuful.iblogger.org/moxujegofetofewut.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/23724033706.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/a71516663e.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/6865710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2014e9e4-78c0-43b2-82be-77149c67db7c/sebapanafomap.pdfIn PDF document text
    • http://dugerem.atwebpages.com/58671586766.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/22312816551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320ce437-3a87-4589-939f-5a9ec5010b5c/69288702896.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 5196 bytes
SHA-256: c853d3592d9b5d3aae214c09eeb9c65f62c9cb8dc0627e27d3ea9e472c1faafb
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10812 bytes
SHA-256: de2add79e5a1c1d665d92096210e23283509a4cff0a3bf859f2e220e17197f7e
font_02_sfnt_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 16220 bytes
SHA-256: cc4abd7d61a178f2172038ea444a26fd0d8fa2ad909be4c3dae0b17281216427

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