Malicious PDF — malware analysis report

Static analysis result for SHA-256 8961e48f6060a8b8…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 00:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c6716e7dabd97abe930d07cc39099db4 SHA-1: a92a40e9375788fcb3bfdf8550161c164a39ef23 SHA-256: 8961e48f6060a8b8803439dca7a7735f5b7b6da5ec8e2dc379cd0556becd9850
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure or a downloader for a second-stage payload.

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/strik?utm_term=can+you+take+real+estate+classes+online PDF link annotation
    • https://cdn.sqhk.co/xekemini/iiij9Wf/offroad_car_qx_mod_apk.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/compelling_conversations_book_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_6011591def9b3.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/jdbcbji/forward_find_a_preventative_primary_care_doctor_pennsylvania.pdfIn PDF document text
    • http://guparob.mywebcommunity.org/comma_splice_worksheet_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_6006d7f6be63f.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/arthropods_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6015fdd6665ad.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/zosevid/33830624511.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/rewuraxekaridenorimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c74b8a6-2abd-4b8b-83eb-c67876288672/guxejijironaxanekugaraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a754c9ae-6f6e-4f38-a4d8-3a1f19831e28/key_eset_smart_security_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daae1298-5e1d-4f5f-b1c1-4b9d75299af2/how_to_remove_pimples_and_blackheads_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/71273941145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e02a16a-4897-4081-a1e1-032960084541/the_power_broker_book_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb9c57c-cc51-4ea4-9a95-fef2f2d32d72/bogagarapipokifizodepujo.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/ravupisowewokasutowa.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/web_services_testing_with_soapui_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/zonifabupozeterada.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_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 4864 bytes
SHA-256: f77c28c841e6a007b4c5031eb94a033afa3da8480ebb340f64d9d324bf5a3ec8
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 10996 bytes
SHA-256: 249f9229b2b759d128e33618a766e34119552bed1996b1979de5815ba399c720

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