Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c69a458143310c9…

MALICIOUS

PDF

66.3 KB Created: 2020-12-17 00:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 45cf9d5303be82140308b20995de15c6 SHA-1: 26d75cc51528f4a9274224f442687758b50cc305 SHA-256: 1c69a458143310c9029898d481ec0f694f73a849a6fa9808b042c5a96e921c39
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam content.

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/aws?utm_term=udemy+react+native+practical+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f917ab5bad4b.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/lijos_savafolawekow_kirujajet_dawozirulum.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/2138727.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/8008187.pdfIn PDF document text
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/4cf0ff12f6c1e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_5fafdff6b4325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f8812db4e5cc.pdfIn PDF document text
    • https://dugilosokufaku.weebly.com/uploads/1/3/4/6/134610324/6405359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_5fa29db4242f5.pdfIn PDF document text
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/0cd0611.pdfIn PDF document text
    • https://xemefotiri.weebly.com/uploads/1/3/4/6/134614789/8867038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_5fa7bbd4d6725.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/6077ea6327e1.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/bodubimofikeve.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/cb103697-0983-4101-afb2-57ec13ff86f5/juvupilorod.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_off0000c4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C5 5368 bytes
SHA-256: faeb3cf24f3dbd6e9e0e6f9ebbe6b7f6168e26430b33b8210885ed67de7f1d8f
font_01_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 10936 bytes
SHA-256: 7c344f8fc55d9f31c4c9f6761059e7a957667b6076acd07cf2a8896e9a7578ce

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