Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd3f032d3ccd975…

MALICIOUS

PDF

66.6 KB Created: 2020-11-11 08:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a54e2f5ac6b868edfb24c6f311fe83c3 SHA-1: 70031db0db002bd73f46eea1da8b01a53c9f70ad SHA-256: 1cd3f032d3ccd97581e0787c103517aa5136396527fc81e1172a9f9e7edcbd22
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm designed to direct users to potentially harmful content. One of the primary external links points to a URL that appears to be a lure for downloading software, which is a common phishing tactic. The PDF structure and embedded links indicate an attempt to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=obs+app+download+for+pc
    • https://xafafiseroferop.weebly.com/uploads/1/3/4/5/134525648/pegeloxexubobuvi.pdf
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f89bf8264b5b.pdf
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/8533808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48ffa8e0-6147-425a-9126-149a84fc797d/20074290066.pdf
    • https://uploads.strikinglycdn.com/files/e51e3dc3-381c-43a2-9b59-c0b724da8f8b/66904976921.pdf
    • https://uploads.strikinglycdn.com/files/e916021c-22f1-4c4c-ac40-3e5b8292bce8/divezugutu.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/ancient_egypt_download.pdf
    • https://uploads.strikinglycdn.com/files/117116b8-0ed9-43c3-9ba6-be0e76ffad61/nulewov.pdf
    • https://uploads.strikinglycdn.com/files/58d0e332-69de-4d94-97b5-dbcb9949f8e6/vurawagepaf.pdf
    • https://uploads.strikinglycdn.com/files/f8a6661d-b2e3-47bb-a28f-6cb89c113ce7/physical_therapy_abbreviation_dnt.pdf
    • https://uploads.strikinglycdn.com/files/d8ea81f4-3d6b-4583-bae0-c9a73e8a0124/80282054838.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c88a.bin
3457b0c2023b74fb6d86cc2a66a5d6e308c1a4e269e77d7adf030c02ab6ab8c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 5408 bytes
font_01_sfnt_off0000db07.bin
ce49e7fe942df799c8a3d87ed2d920b711d6cef8f5ec8bd54c1e5058e87e18ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 10152 bytes