Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf4ef0b2707e62b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-13 23:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 28e606a0987163e1fac55374cfde87e4 SHA-1: b862e52ce8d24684c3f58d3061f0be8083f44fe9 SHA-256: cbf4ef0b2707e62b7b55eb37c56bfd7799a7b3c2d461960a975384f3e6d3374a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=the+importance+of+political+science+pdf PDF link annotation
    • http://fuxejujedij.22web.org/27972721691.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/25529401551.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/ninilobokup.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/79230101466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafivinada.rf.gd/lajazik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2da56d-5c86-47e9-898c-bcd3dd840674/kenworth_t270_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37dbd0c-5c88-4c49-9102-0268ddd372aa/management_information_systems_mis_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e23bdf-a8c0-4be1-bbff-92f360cd90b3/planet_fitness_membership_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7764386f-b421-4ed7-9e54-26f5d5e4ae90/78482790288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a501419-2da9-4e24-bc29-fe4d6a86cbb8/medieval_2_total_war_stainless_steel_6.0_download.pdfIn PDF document text
    • http://vigukesege.epizy.com/87755454625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7923327-c762-45c9-859d-3554ea2345e4/how_much_does_brother_pe-design_11_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea4b369-679c-4e7b-a3c1-b1d188785096/meek_mill_book.pdfIn PDF document text
    • http://xotaxebotejij.rf.gd/4816611022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac40c09c-9b9d-435b-b70b-bc0873eab7f7/the_complete_vegetarian_cookbook_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf5fd82-e23e-4379-a5a6-8d5ddaadd827/reloading_kit_for_beginners_price.pdfIn PDF document text
    • http://xotepugiz.rf.gd/dewalt_xr_circular_saw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4322d85b-b872-4568-8c98-ef888f493cbb/37572171746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ef9620-cb58-4e98-89d8-e1d40bd26043/44742983928.pdfIn PDF document text
    • http://zadaxuro.rf.gd/70023869601.pdfIn PDF document text
    • http://vafikozokus.rf.gd/printable_bubble_answer_sheet_1-60.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_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 5344 bytes
SHA-256: 4d1b5ac3fcc98e19da8124e6cebc3d7edfcf06b0f5ce74c14589b42a0cf755d4
font_01_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 10540 bytes
SHA-256: c5b50e11f1a880445fc33cd206ad43b64931999ff7cac6c433de8d3f29e5b777

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