Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff540577e1daabc…

MALICIOUS

PDF

74.6 KB Created: 2021-02-18 01:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b31d919078ef1cddc88cabd74a2951f SHA-1: 379aa5a850044f700af131e230fa2ba0806f0fbf SHA-256: cff540577e1daabc6934f902a382eeef657b3a956d129f0c6992aba01d632403
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=computer+hardware+parts+and+functions+pdf PDF link annotation
    • http://gatorama.space/zefojaraxelagopoghzqm.pdfIn PDF document text
    • https://zumugerajezu.weebly.com/uploads/1/3/1/1/131163828/6776722.pdfIn PDF document text
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/8984438.pdfIn PDF document text
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/xuzeviwokukazoruf.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/dilakogewiza.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/5T6lNwB/new_funny_ringtones_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/aEixmne/minedipidaxar.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/1185832.pdfIn PDF document text
    • http://yesitalia.fun/nea_marin_miliardar_film9hq87.pdfIn PDF document text
    • http://detonic-italy.website/565090175846kxm7.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/2519810.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/6696357.pdfIn PDF document text
    • http://fruittea.space/unicorn_free_icon_packehxin.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/negogewuba.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/Tgfhe37/73716308185.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/hcihjdw/linotebiwuvomesowudigiko.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/ihgiVi7/27208846074.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/df8dc.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/Y6jfpUa/61586075319.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/bulikowexunepov/4956507345.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/54931997670.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/heathcote_secondary_school_ofsted_report.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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 5360 bytes
SHA-256: 19e978ef43c5cf4b194e0efc1d9ea3400727c936a236e8eba52e8c36df52717a
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10104 bytes
SHA-256: b570d47c0b3d7136b7c7ecb45860104d9a67ebdc6ed8f71a29c7f2bcb5502395

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