Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46465913e0bc9c6…

MALICIOUS

PDF

67.6 KB Created: 2020-12-31 08:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 339942ad3aa439f314fa22ca0a7e2145 SHA-1: 2fb1e9e2c326537f8a7057ada3cbaaccbaee63c3 SHA-256: d46465913e0bc9c65839216e83e4cf7f75dcbd4c24ebd690b02e00a711ad36df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to other PDF files hosted on various disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=the+grand+winston+salem+star+wars PDF link annotation
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/8a4db60d675c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fdf48b4df42b.pdfIn PDF document text
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/jidijuminubasimivik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_5f9dc18989395.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/aje7Ujb/guneramuwawobil.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/bokokefifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fb2d6fbc912a.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/wafokanojozarisil.pdfIn PDF document text
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/5af13.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gupawupigawono/76899421587.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/us_postmaster_general_address.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 5068 bytes
SHA-256: 67b7c50aba2a702ded6714095da47a7656187ca1b36b836f5b9013337532a6f6
font_01_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 10628 bytes
SHA-256: 189fb9532d25ca1b459442dc72005eb36c87c4051935384b3031ca875938932e
font_02_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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