Malicious PDF — malware analysis report

Static analysis result for SHA-256 befa7560816f4380…

MALICIOUS

PDF

77.1 KB Created: 2021-04-14 17:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c29f95e0a5372a383989efc012537ee3 SHA-1: 69cc134d3db3b15e7203efa4f120fa9c49ae26c5 SHA-256: befa7560816f4380012496a7bad3068cf00cc4191cceddd0a7e92520d2bb0666
186 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=series+of+unfortunate+events+book+12+summary PDF link annotation
    • https://terunutu.weebly.com/uploads/1/3/5/3/135319236/gabusukukipisad-mozedidixab-furape.pdfIn PDF document text
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/4638762.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/4f26b76ff0c94.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://mazers.fun/percy_jackson_sea_of_monsters_book_ar_test_answersd5dr7.pdfIn PDF document text
    • http://gisujug.mypressonline.com/pefodurukikexedujudoxik.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/nec_article_210.pdfIn PDF document text
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/3260360.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/9764487149.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/wumum.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/puroketomi.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/fundamentals_of_electrical_engineering_bobrow_free_download.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/288ef6e5-8801-4dcb-ad6a-8b7f6afdb9b4/cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5cf0d8-0c9b-4eca-af06-d78d31fa5d78/dewalt_10_inch_miter_saw_cordless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bab6730-3fd3-4092-9a58-a0709029f437/sharepoint_2013_designer_workflow_add_user_to_group.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/amfetamin_bamll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07ebdba-968a-4fcb-afcb-58ebf2bb8e63/philips_system_one_humidifier_settings.pdfIn PDF document text
    • http://somasetowijo.myartsonline.com/gokesififakelogaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c28c1da-9048-4421-b2b2-40242ea4d551/takaledonureb.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_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 5532 bytes
SHA-256: 2797897c4632d719a04b3c4a3c558f929cd604d0dca8f6f10bc6be14fa9fced4
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10476 bytes
SHA-256: b1e89232ffa4401d7165941a6bf7a0804fb8c6b7e52b91b344e532702b21b6c8