Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc6e75d341c9e7e…

MALICIOUS

PDF

77.6 KB Created: 2021-02-19 14:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a2e1290f03bdf30901b66ee7d8873af7 SHA-1: a37b70c9f4e835b8797c7b270cf3ee4718601e4b SHA-256: 4cc6e75d341c9e7e4b3fe6219be8cf7b89e7860e5673b9405a7b3c9a22ed774c
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 0.9998

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://jacksth.ru/123?utm_term=how+to+set+up+onetouch+ultra+2 PDF link annotation
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/fijuxot.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/sLidjjL/halo_rover_hoverboard_video.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/144889.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/ha6cssI/nubowuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/iqibSVb/attic_24_granny_square_blanket_border.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/Xahdjhz/checklist_example_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/Tjjifwz/48850638269.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/8f3e5935cb4523a.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/W9jRjnQ/world_war_ii_airplane_models.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/jeVELie/jitegemak.pdfIn PDF document text
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/pulodiwifaveg_febonuli.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/wiwuxot/tazafogup.pdfIn PDF document text
    • http://gorudagomi.rf.gd/bar_bahar_full_movie.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/descargar_hello_neighbor_hide_and_seek_android.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/nufebifu.pdfIn PDF document text
    • http://dunaditi.rf.gd/juzapotunigazikosevasim.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_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 5204 bytes
SHA-256: febf15e61e539fc6879b6381973833ba74e002810702e81f59fcc5b11e928bb4
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 10576 bytes
SHA-256: 76003b59f8ac9f540a80f74af8313fdfc0e6488cee8f9a3df4601d4c67559af5

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