Malicious PDF — malware analysis report

Static analysis result for SHA-256 632db09c548e41c2…

MALICIOUS

PDF

72.8 KB Created: 2020-11-11 18:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d3d0a4b0a4605b07c366037c96143fe SHA-1: 20528b4fc244f5e56166752d667002a01259ee1d SHA-256: 632db09c548e41c2072e678d95f5c38ac7d1b18354c1e41fa318099cd2e69346
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or lead users to malicious content. The presence of a malicious redirector URL further supports this, as it likely points to a phishing or malware distribution site. No scripts were extracted, but the nature of the links suggests a phishing or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://cctraff.ru/aws?utm_term=small+stock+production+pdf In PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/voximaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f9c18f76a419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f8bcb9a1d3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8d52791d8c8.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/dirilo_rodejipope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f89675f2c45d.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/donuvokoteri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_5fa6e3bbe0bbb.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://uploads.strikinglycdn.com/files/3fac33e7-d155-4141-ade3-703917dfcee1/36569371663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e219ec15-bbb6-45fc-84aa-2ef8693763c6/86384141658.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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 5232 bytes
SHA-256: 32a00f92ef4414ae66bbf67c0de89be73d2df493b2bbf1b2fd469fb08a7a0a80
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 11248 bytes
SHA-256: dcfa9024214ded70ebaf53ea02058ea4ff6bf1e6db2ba23e7ca82764d3e1d9c3
font_02_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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