Malicious PDF — malware analysis report

Static analysis result for SHA-256 04311f920d54daa3…

MALICIOUS

PDF

64.3 KB Created: 2020-11-10 02:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 06277f9789b47cc9e0894df4a9def0d2 SHA-1: d281e46aa353d675d0461c954b9518fabc564a25 SHA-256: 04311f920d54daa39a49b97eacd666c95458b61df1406699429cda085554c196
156 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 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
  • 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?keyword=hamilton+county+auditor+property+search+gis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f966b8bd22c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8ed6c418927.pdfIn PDF document text
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/lumesobodazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5f932092c931a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6346b59-7e0e-4e9c-900f-74d43a5e7116/naruto_jutsu_hand_signs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d81adf-d37c-45ed-a8dc-5f7255de1d7b/sanidajazopolujarire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f63737-3327-46ad-b38e-5d7b4b3d283d/gilumifevijir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b1b386-4296-4185-9f03-b7f663a75e35/tipos_psicolgicos_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70fc0c6-d7bb-4aea-9bb4-dd34ede031df/pabati.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/ddlc_what_words_does_sayori_like.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_off0000bd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9C 5548 bytes
SHA-256: 431b593071c25b94651d8355173062a8666f08280bd4af964d7227028f98d240
font_01_sfnt_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 10736 bytes
SHA-256: 5c2819ed0c1c866acd7475b6546d46da75ba25b634d82e972ef0f7be6e32e549