Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dd0565c3cb8cd1…

MALICIOUS

PDF

63.1 KB Created: 2020-12-17 18:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9eb17b24fbaa48686d0cbe986055d17c SHA-1: 33d02ac2d6dd820a4921611d2276b2cdb7054e25 SHA-256: 37dd0565c3cb8cd17c16c6854fd7a3a295e306e432b7a96929d7b6f55fbe7d67
244 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links pointing to external PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious content. The heuristic firings indicate the presence of malicious redirector infrastructure and a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=sharp+weather+station+spc502+pdf In PDF document text
    • https://zamelati.weebly.com/uploads/1/3/4/6/134652334/batufej.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/lulesuzavumadigofere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fb87a3a61d67.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/bewigawilexulexi.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/tumubozudupulol_mokap.pdfIn PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/e87a756302458c.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/3020588.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/gajewojokosar.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/kupafunatum-kelok-xolari.pdfIn PDF document text
    • https://felomadexibeb.weebly.com/uploads/1/3/4/6/134687620/bisep.pdfIn PDF document text
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/dapos-kuzezatozu-kezevedanite-zexoza.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/5353639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e5b84fd0-9f79-4b45-8e10-1be2f6d48cf0/godetisimarawadabonax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC35 5592 bytes
SHA-256: 0b7e0dc59db0301afe81026d57022469aa7b960251f5ee2df839fa9df105a5ee
font_01_sfnt_off0000bf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF44 10160 bytes
SHA-256: 55e40af35e8e385266dd8107fb7da3276136c8e06d4a6f75951f0821d3d5bb9e
font_02_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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