Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dff5dd6a6591b97…

MALICIOUS

PDF

69.0 KB Created: 2021-03-25 11:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a2d55988393e8f11d3e931efdcef37bc SHA-1: 12bbd0005defbcd0c9e71e125f18fc435be985f3 SHA-256: 1dff5dd6a6591b97b65b229408b89e2715ad692d7a9b57d510cbe33111189dda
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. The presence of external URIs and link farm heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely intent to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://ponafet.ru/strik?utm_term=citizen+eco+drive+wr+10+bar+gn-4w-s+precio PDF link annotation
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/wogepejof-pizus.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/8304604.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/bifepetapaweweli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_5fd10d3851cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_6054ad8a80913.pdfIn PDF document text
    • http://xilavinem.medianewsonline.com/vic_school_calendar_2020.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/21420091610.pdfIn PDF document text
    • http://kewotij.mypressonline.com/biblioteca_digital_mundial.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/8f9317b530.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/4629546.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/nufoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_603d761f5a922.pdfIn PDF document text
    • https://lexolegav.weebly.com/uploads/1/3/5/3/135350326/dameturelaxafel-jutopej.pdfIn PDF document text
    • https://mewupevubuk.weebly.com/uploads/1/3/5/3/135387541/mevigutuwazobujes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_603cc285c5736.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/6dc50f0c-a50d-4d6d-9f89-9597f079da69/kawezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b08c6a-4070-4c33-bc31-ba237d3142c4/61726191796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc5f797-37dc-4c42-9abf-b3353cdfda37/grade_3_english_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3182d849-8224-4076-864b-377203c0f39d/49844467786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788eb160-8603-4be9-bf89-2b83f9b4a695/what_is_the_salic_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a7cb33-616a-4906-83ac-33982e30b98d/how_to_replace_a_wick_in_kerosene_heater.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_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 5772 bytes
SHA-256: 3c09edd9cf9734b8663a9fd3b84646cdcd41a27eefeed50dd47c670128bd35eb
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 10952 bytes
SHA-256: c86615758d6e2e00555d745f67930f049e46fd092572df31c43c0f75b16b09c0

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