Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c792d8066cf36f6…

MALICIOUS

PDF

59.6 KB Created: 2020-11-19 20:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d607ab3e570dd495bb026e868813c5a6 SHA-1: 25a0f1929b85c211e4ad3c6d00acf8edee114e96 SHA-256: 7c792d8066cf36f66c066d292532e0150b7f60448d24454ceeb1ce9d7837cd0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external PDF links, with one pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=standard+methods+for+the+examination+of+water+and+wastewater+23rd+edition+citation PDF link annotation
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/5e27d021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f8f4da8edbe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f983c20b624c.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/fopalew/kekenaginuzipi.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/55788833888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0512948-ccab-4012-945c-b77dd3d703ba/nidaderiwelogevigijap.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/63630357259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f988d1-a289-46cc-806f-baededa8a1ad/at_t_white_pages_tulsa_oklahoma.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/552358358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f7bc77-48d4-4052-8a94-87abaf09127a/consequences_of_the_russian_revolution_1905.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/fowevotopevajusabilaj.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_off0000ac06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC06 5788 bytes
SHA-256: 0969757de5cbd0aabef574cd86e346f7febf015a2d35d21ba8c57e4c37f62fc2
font_01_sfnt_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 9676 bytes
SHA-256: a601fac5fdeec11920ff9c3b58d045cfaf30c60237b5d924d4cd2022cc01f48d

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