Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0ad875f2e75bd2…

MALICIOUS

PDF

65.0 KB Created: 2021-02-08 10:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c43679eadefd3e697b73ce98ffd36e68 SHA-1: 2713838782e4f37ce4fcdecd5ed4d4e138b1148c SHA-256: 4c0ad875f2e75bd2366aed28f421212e1380081ea90e9052becb39f0dcf61aff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=basseterre+weather+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5feb0eaf02e85.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/zanivixobujini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5ff2dbaa59803.pdfIn PDF document text
    • http://rawoferifexa.22web.org/tofivutis.pdfIn PDF document text
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/98c4c637f09c6.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/69476921709.pdfIn PDF document text
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/bebejagebat.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/rinavegomubosagix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvetimimu.rf.gd/ccw_cisco.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/kamikaze_lil_mosey_free.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/bawanitutujetatifexenuseb.pdfIn PDF document text
    • http://texaliborobiko.epizy.com/alaiye_sitralaye_full_audio_song.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_off0000c39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 5016 bytes
SHA-256: 98573c6e0e9ac2e9af1c1cca299c71c577c9dd82c63ecb58ea652ae492a39fc7
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 10140 bytes
SHA-256: 3f6bac43bd0c6753a4a7007707ae4d2e50f4d5a1a56548e3e6cc40920be3586b

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