Malicious PDF — malware analysis report

Static analysis result for SHA-256 830a3991ddfd0062…

MALICIOUS

PDF

73.8 KB Created: 2020-12-30 17:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1a1c86ba72a2a2df2d221c5b497c83ee SHA-1: c2a68dceadd64b090711e1e6972c187f13aec2c4 SHA-256: 830a3991ddfd006277fb7e7112147bb0d03b07a7490f37424858e977a927ce63
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the primary function is to redirect users to potentially malicious or unwanted content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafftec.ru/123?utm_term=keto+pills+at+gnc+store PDF link annotation
    • https://cdn.sqhk.co/kozuvurop/ggicxDs/63603355078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5f9204dc68ff2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fddcbe702703.pdfIn PDF document text
    • https://bazawafamojuw.weebly.com/uploads/1/3/4/5/134508147/ba26ea2b8e158.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/fhbQDjg/wilunezebofigozemip.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/83141ec6-118d-4399-91db-e93e51e7478c/raxuluvasafabunuleradof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5e542f-1f1c-4b88-b688-c3b49db0ddf7/simple_communication_diagram_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f769c413-457c-4984-af03-a619d5d8c0d3/lucky_trouble_movie_download_in_tami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc2f8f2-e205-4cda-beec-5e7aba17bbdb/land_rover_freelander_workshop_manua.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 5068 bytes
SHA-256: 0d401cda127907fd4d7e6cb8dfbbde6ed64896ada801af16282c6a0eba97fd86
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 11084 bytes
SHA-256: 86e517478534dd51eb5ef35219e9145e542f9986f87b075658d7e29123390784