Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25c163270bee9a7…

MALICIOUS

PDF

93.9 KB Created: 2021-02-25 13:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4969779e286b4b18e1ac2557faa8a8c SHA-1: 035bf209eb1a07663c7edc686d48a7c36ba3cbf5 SHA-256: a25c163270bee9a75fdba03a953a5b9e427387d1bc2675074be878c76fd8bc43
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though truncated, contains text related to 'clicking noise when pedaling hard', which is likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

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
  • 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://jacksth.ru/123?utm_term=clicking+noise+when+pedaling+hard PDF link annotation
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/vivopodana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fc7b520339e1.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/shakespeare_sonnet_29_explained.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/67744898919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_60185b92b1adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6032bed0112db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6014b272408e1.pdfIn PDF document text
    • https://nasuzezigoma.weebly.com/uploads/1/3/4/5/134587751/ramofarurawitivob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fec032ba06dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_6009e0372fda1.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/zefukeroxuterafogula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waxeduvipi.epizy.com/after_effects_transitions_plugins_free.pdfIn PDF document text
    • http://miviloliwibo.rf.gd/4273079020.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/utorrent_android_tv.pdfIn PDF document text
    • http://tifobegujetesa.rf.gd/54094677126.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_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 5396 bytes
SHA-256: 9b02db4fc605002e30fc90afbedf79b76c34094114b1d26697177ca1179059ce
font_01_sfnt_off00014594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14594 11052 bytes
SHA-256: c077dbfbb3d9cf414aa4efb840b1ca9c6ee33b6916e6e84ab3da3cc6a68bf91f

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