Malicious PDF — malware analysis report

Static analysis result for SHA-256 254fcea23a2ff8dd…

MALICIOUS

PDF

91.9 KB Created: 2021-02-18 16:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c8632978ba8b87cc8c3b0a608da23329 SHA-1: 871cfcb52f78d738bb4a44cd3393f9ffb9ce0f44 SHA-256: 254fcea23a2ff8dd035f1475718190b9f42bbdd6df8dca59006b4de049e84f6d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to a malicious payload or phishing page.

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://jottigo.ru/strik?utm_term=analisis+del+libro+el+lenguaje+del+cuerpo PDF link annotation
    • http://guvizaw.22web.org/plantronics_explorer_500_manual.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/08f1c559c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_601650c229eb9.pdfIn PDF document text
    • http://minoduzu.iblogger.org/plantronics_cs510_wireless_headset_system_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_6008a4217916c.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/3961097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5ff2133a6ca76.pdfIn PDF document text
    • https://bezubimuxidisa.weebly.com/uploads/1/3/1/4/131453869/wuxibik.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/a3bcb17c5b460.pdfIn PDF document text
    • https://xidozuju.weebly.com/uploads/1/3/4/5/134597445/vesuw_dasopolukakan_zewogi_rebutugumuw.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/setij-fidufano-fodimalusodanup-miworoj.pdfIn PDF document text
    • http://nikepexi.22web.org/34265307149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diveruwafulebes.epizy.com/hey_what_s_up_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/assassin_s_creed_unity_companion_apk.pdfIn PDF document text
    • http://zerujafulo.rf.gd/pro_bodybuilder_workout.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_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 5448 bytes
SHA-256: cf50bdb46ebfe4bdd93074a11db6a25289e5ef87f276bdf91bf57842d21d42db
font_01_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 13144 bytes
SHA-256: 98cf0999355fd3f667cdc61e60ce532f4b1d954af72bbc5b167cd32ca7aa11d0

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