Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3e0ad695005e25…

MALICIOUS

PDF

59.3 KB Created: 2020-11-21 17:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6d5875759c37ecf36f66120cdd8302f3 SHA-1: 79508335b998e9c42fcce8c948ce3a783852db3d SHA-256: ba3e0ad695005e25915d4b572e7f316877dcebd6140cf2892a07cf09337639f8
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=rubbermaid+big+max+shed In PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/5850595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5fb8c049c018b.pdfIn PDF document text
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/rixaputu-xokibilap-dusima.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/tezaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_5fb4b6e2919a0.pdfIn PDF document text
    • https://mepuzorow.weebly.com/uploads/1/3/4/5/134500467/7195372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_5fae350c2b980.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/jufolexox_gepaju.pdfIn PDF document text
    • https://wowutelugige.weebly.com/uploads/1/3/4/3/134359508/7534911.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/560222.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/a8401ec7a9859.pdfIn PDF document text
    • https://ninadagonalot.weebly.com/uploads/1/3/4/6/134668818/xuxuzanefunox_numewuveba.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/sesafefanulokam/nupejejosopagisazofanolo.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_off0000ac8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8E 5420 bytes
SHA-256: 02ac5f9bbf7a97599f905c7f7731290fc22b43d014c473ae35081d25f4bca55e
font_01_sfnt_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 9416 bytes
SHA-256: de9f366c878fdbb258fa7ae7d88add7274fb5a233226570b472d35fba4179fd4

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