Malicious PDF — malware analysis report

Static analysis result for SHA-256 245a3964dfcd009d…

MALICIOUS

PDF

77.0 KB Created: 2021-06-08 08:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec912ca4a7e2c32d49e51647e579a3cd SHA-1: eb59e59eca43e48bb1f54f1258197876aa296164 SHA-256: 245a3964dfcd009d2448608019c6ba239a70b432a24751a84bdd095e139c01ca
186 Risk Score

Malware Insights

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

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 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://wastran.ru/pbw?utm_term=motor+control+circuit+symbols PDF link annotation
    • https://feselezoretun.weebly.com/uploads/1/3/4/6/134690260/levoketep_gebowo_volurofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_606bc442ea1a8.pdfIn PDF document text
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/8bc52b539445f1e.pdfIn PDF document text
    • https://pagukusiko.weebly.com/uploads/1/3/4/6/134631218/5115139.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/dipuweb_rapada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5feb961becd6a.pdfIn PDF document text
    • https://budoxaku.weebly.com/uploads/1/3/0/8/130873914/tudabu.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/c63fb495-b25d-4e0c-a6b5-fde4e433ca86/poema_tu_risa_pablo_neruda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd7b3b7-c365-4f50-a927-4298906550c4/30286882657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3799f182-293e-4169-a5ce-8c24ae17d51f/90696550240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a816d6-feb1-465c-bcaa-9d1dd7ed5937/how_much_do_navy_reserves_get_paid_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22541085-1da8-4eb5-8f15-3a35f9c4b5a7/tidodizikobozebisol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca68f95-a3b2-4e8c-9791-b76cfec75fbc/budugonunun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfba16f-87c3-428c-a249-d087d0d86adc/jovaxefoverupezofufewel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d505a6-a62a-4dfd-aa9f-01127b01aaf7/panasonic_nn-sa651s_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e80b75d-731d-4f76-9a68-a4f673f5baf0/14553794721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ba7429-fad2-4edf-bb61-63309509cc3e/exponents_and_scientific_notation_test_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7daa4c-ef58-4062-8f2d-1e0b36a3720d/97781246711.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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 4980 bytes
SHA-256: e5b3144cf5cca0c73e51c29606ab83cae629b83386efaed103c1fb7822e833b2
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 10188 bytes
SHA-256: f25ba53f890ff1b5a47df2c0bc134caf4dddfc316a2f4f253ef555a883acc941