Malicious PDF — malware analysis report

Static analysis result for SHA-256 648768ea3e67dae1…

MALICIOUS

PDF

60.5 KB Created: 2020-11-18 13:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 54f25cc8cb555f84882361ad2db87c1c SHA-1: 16cb3416e90e4323b3f19d320af770340e8a401e SHA-256: 648768ea3e67dae119c15433f88c2c82651da54f7c6059b739b886cd003d9e27
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 0.9996

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
  • 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://traffnew.ru/123?utm_term=sandakozhi+2+tamil+hd+movie+tamilrockers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5fa99e2c850e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5fa4c39710e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f99191fd4670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fad5c6b7145d.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/silumidawu.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/dazumaviwutumox.pdfIn PDF document text
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/7931455.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/wazitafogam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8740a47089b.pdfIn PDF document text
    • https://jaxazinozusepir.weebly.com/uploads/1/3/4/2/134235406/34421.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/2310212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fa99822150e0.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/zolerazowubow/company_catalogue_template_free.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_off0000ae2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2D 5588 bytes
SHA-256: c6ac9e1d46584429a79b3f382513dcd849df75f2060b6bb7faeafb98086cf2c2
font_01_sfnt_off0000c112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC112 10280 bytes
SHA-256: 7d7568030d4785c4c46f4fc651f6c38a6bcd28d1c72abb67defeb56db1b10ac0