Malicious PDF — malware analysis report

Static analysis result for SHA-256 13711e7fbc4b576d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 10:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05d35bd881a3699b5e1a57d95af79577 SHA-1: 57db60a0b70366a6fa21084a714f15f373461525 SHA-256: 13711e7fbc4b576d3c35e81fc78d747fefe0578699df384011ae5359ddfa4334
126 Risk Score

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://soxebez.ru/wix?keyword=clicker+heroes+codes+for+rubies+2020 PDF link annotation
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/5786887.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/YKhlieP/rewibisizevunesasutobel.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/FUjjjfX/christmas_hair_salon.pdfIn PDF document text
    • http://piredvizhnik.com/the_game_changers_book_reviewvjtgo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/jeZfjbn/24352244208.pdfIn PDF document text
    • http://tekplafond.xyz/best_books_for_mechanical_engineering_interviewg4v5y.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/74985784978.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/blades_in_the_dark_player_kit.pdfIn PDF document text
    • http://kismykeitio.best/sims_3_free_for_mobileq642s.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/55142055765.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/hcTegiV/pressure_washer_replacement_pump_horizontal_shaft.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/moxovinibavofubu.pdfIn PDF document text
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/niguzajeruku.pdfIn PDF document text
    • http://supermagazforsale1.xyz/dell_1320c_toner_level_checkbjvrd.pdfIn PDF document text
    • http://mainsale.info/the_last_of_us_all_trophy_guidelau2r.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/fumegebijowaban.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_8173ab1381c94a8789eb914b9177ebda.pdf?index=trueIn PDF document text
    • http://vobozezojip.onlinewebshop.net/wolufesiwifibepadov.pdfIn PDF document text
    • http://jimarol.myartsonline.com/93531017569.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_9f069bb0391a405a930ab2f06916c4ed.pdf?index=trueIn 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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5284 bytes
SHA-256: dd40a453f4faa1cc433928991ef0347d1eb6c1336c23d65ebaceaf05026c8cd0
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10724 bytes
SHA-256: b1abca2e8700298ad2cb93d9ad922fc9c0b5250704fa17933be966b35319f3e4

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