Malicious PDF — malware analysis report

Static analysis result for SHA-256 d172698dc8f23693…

MALICIOUS

PDF

72.0 KB Created: 2020-11-12 20:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ed29337109def0a65b18b0b1928ef38a SHA-1: d0da1e6b0adbeeb467b96a72a884fabb9696540d SHA-256: d172698dc8f23693450eaf72ec7275b9566706c5565e97ef65d5e97d32c6981b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=bound+by+duty+book+2+read+online PDF link annotation
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/9add130e6ae2665.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/8463818.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/xovilefuladoku.pdfIn PDF document text
    • https://fofelopuvamugav.weebly.com/uploads/1/3/4/7/134716477/biroruwi.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/taxadifupesafutom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_5fac4670d595e.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/pesekavitub-zawixufegiba.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/kewuxejikiwe/27486448528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc7321e-ec87-4649-9c9b-ee8fb61fd910/78339672831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cca269f-2d85-4255-8c2d-6b6b04f09b2a/yamaha_rx_v479_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb6eb8c-8edb-4235-a0f9-f58af553f62b/45745928606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368090a3-4c7f-4958-a5db-c00c33e91a49/19470599605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8c4a0f-2ac7-4fc3-a25a-c38e59a7f168/the_game_of_life_and_how_to_play_it.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 5128 bytes
SHA-256: 4feda3ab5691f31a62b0791b74df3c6523918dbc09a7c6a7ebeaec1734607a41
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 10640 bytes
SHA-256: 98f8d6d181a4fef62a5612c566679a523b1ab4fa39f1fc7b5fc7959bfbe7e9d1

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