Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d848ba2359bcd5e…

MALICIOUS

PDF

72.3 KB Created: 2020-12-24 20:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f15349c38469c24bd029ac60e063caf7 SHA-1: 775665b45c9852c2b88e9d81d8d2f7d7682b496d SHA-256: 5d848ba2359bcd5e4152b4645e1f9cbc8da8ca9ac8e221a0ef1d4bdb8e028b4f
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The presence of 'utm_term' in one of the URLs suggests tracking or redirection for malicious purposes. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://trafffi.ru/123?utm_term=what+are+some+good+u+words PDF link annotation
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/nafudefinemos-vadetotigomi-sexituxeximana.pdfIn PDF document text
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/podabufinelepaw.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/8118877.pdfIn PDF document text
    • https://jafutefas.weebly.com/uploads/1/3/4/4/134489285/8eacc.pdfIn PDF document text
    • https://tixatodaja.weebly.com/uploads/1/3/4/5/134507568/doritoriwigibimil.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/ce89e6bf65.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/wetine.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/jarawaxanivu/jerenulurofopefesularilad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f8289d-66e0-4528-bede-0f15befe53f8/jerun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b585fe33-5d1f-4c91-8981-9c6fcc93239f/bl2_black_hole_farming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1e7347-b359-44e6-891a-023d7519c805/retobemajiwexegiwatodazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7c76e2-547e-4450-ad9b-fe6bec05e9ce/lawimakeraresibitobevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b46b7a5-87b3-47c7-8aa1-23f7474fd55f/bakedowon.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/veserivelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c28b7a-ee38-4d15-bd0d-236147dfb9ea/vugew.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 5312 bytes
SHA-256: 2d2c46bc0090858f1114cf6408519d7293320ecad6cf450dd770c70d73a6bc59
font_01_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 10288 bytes
SHA-256: 7364f1148cf3bdacf052ddd9e7c7d08a8f6efecd4f59c9e26a2ca56e0d41572e

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