Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bdca6caa556c2c…

MALICIOUS

PDF

72.8 KB Created: 2021-01-19 05:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab8614140482c16cb10079fe2aa209a4 SHA-1: 71ae2518f1ef34aefc63cc897a97edc596352a40 SHA-256: e1bdca6caa556c2c69bf8e8828d0fe73ce44d143d149967e5bb43337f3f9aa07
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the presence of a malicious URL suggests an attempt to redirect the user to a site that likely hosts a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=teaching+writing+skills+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f93089414af1.pdfIn PDF document text
    • https://rosivitowa.weebly.com/uploads/1/3/4/5/134590356/gakovesixixadago.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/8309859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_600073f41fb30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fb85bc9bf6ac.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/fnjahjj/kowavesufuxafovo.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/Jkhcgho/35954498560.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/m8jbSUj/bigasuwawexivine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5fd339581e081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5ffb695cc5515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdfacc855b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_5faeca0b24ff0.pdfIn PDF document text
    • https://cdn.sqhk.co/tenerinirik/oxiboAu/wix_fuel_filters_any_good.pdfIn PDF document text
    • https://dedofuzogod.weebly.com/uploads/1/3/4/3/134374436/487ee7.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/wuzalugiseto/xeziwexu.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/asthma_control_test_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/manugiwogenawabusuritaz.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/lexuxijefadenixurejad.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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 5524 bytes
SHA-256: 85ba48864e4be13cf89d703c9ad521b92a2a6afc67f6ad1f8bbb9248d2a4d1c3
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10232 bytes
SHA-256: d85e3bc45fb7a4b9161bbf9e5919b9d5ae84b7548f79d7a371638b2891a924bb

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