Malicious PDF — malware analysis report

Static analysis result for SHA-256 96aac8b488fc2316…

MALICIOUS

PDF

76.1 KB Created: 2021-02-23 03:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1384b9b5d22e976f20e3b03e6112f7b SHA-1: 53ea8c21c8f76f22d03e0a3f00305e2b7d0741ab SHA-256: 96aac8b488fc231631a948049453792fa0c90137f9667df6a423705eb59c8267
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 0.9997

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/123?utm_term=how+to+do+vector+addition+in+matlab PDF link annotation
    • https://cdn.sqhk.co/terasovo/EihD1ib/nolamejite.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/Djfii4u/garabowe.pdfIn PDF document text
    • http://obschee.xyz/6870c_0401bwqm53.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/9694929.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/ifgfiiF/french_ombre_gel_nails_short.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/fjihahh/99912002599.pdfIn PDF document text
    • http://ketotreno.buzz/charlie_s_angels_soundtrack_albumvx50q.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/Ohfiegi/explain_how_to_manage_a_budget_in_business.pdfIn PDF document text
    • http://strahauto.website/oxford_dictionary_with_translator_mod_apkfpquv.pdfIn PDF document text
    • http://martakkord.ru/baidu_antivirus_free_full_version_2019p129b.pdfIn PDF document text
    • http://vovpomnim.ru/7853179079720t13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/14203424525.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 4948 bytes
SHA-256: dcf65d2f8cf47c983dc7291b08201a13329961f8a5cb2ebcb4b616e8fe5100ee
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 11352 bytes
SHA-256: d6115fb87787dc99cb005f13c9bf8e6211a3675e31cfd38b90b7b364695837ce
font_02_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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