Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd590198df5251…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 18:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dfaaca73ac5ff6ef7c0ed7c618f0c1de SHA-1: 884846cd3784c1628d6cd66b6b658455a744372a SHA-256: 98bd590198df52513eb60aba709dc781ce25e4dfae84fd3921a1668ae3e213a1
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 0.9996

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://dafemum.ru/123?utm_term=american+pie+guitar+chords+pdf PDF link annotation
    • http://tidirakozodawon.getenjoyment.net/how_to_create_an_app_for_dummies.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/2186959.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/why_art_is_important_to_young_childrens_development.pdfIn PDF document text
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/zifaxidepi.pdfIn PDF document text
    • http://mapenibo.scienceontheweb.net/futuristic_architecture_concept.pdfIn PDF document text
    • https://sofusetagiwubok.weebly.com/uploads/1/3/4/3/134320735/vosalo.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/dd5813fe6b95a79.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/9295983735.pdfIn PDF document text
    • https://xumusozopojuvuj.weebly.com/uploads/1/3/1/3/131398507/sidofomudubifug.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/depazoge.pdfIn PDF document text
    • https://togoritireso.weebly.com/uploads/1/3/4/6/134619717/kavitabuzarekimisasi.pdfIn PDF document text
    • https://wemafijape.weebly.com/uploads/1/3/4/7/134775870/xukunufosifa-zetexeloj.pdfIn PDF document text
    • https://rawonosegapit.weebly.com/uploads/1/3/5/3/135314608/ea583f78d4c7377.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/04275a741bc9118.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/kawidagekowafewoj.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/1708970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f1ce88-b1be-476e-8591-c80b817d6a57/ilive_5.1_32_home_theater_system_with_bluetooth_ihtb138b_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2b1fde-701b-4a4a-a190-2869f1bc5f0b/11272074314.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/mixagawimefisufikaniw.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/encyclopedia_brown_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f12e579-eef4-41a5-8821-08106dcfeab1/64071022592.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/cub_scout_leader_manual.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_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 5528 bytes
SHA-256: d1cff714e847abc4b5b9ad3ada717721cd306389b221e59bc1e193521fa2ad5a
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 10580 bytes
SHA-256: ed2321fbcf0a510ea12b57b4eec7f376d88e6af679bb660c82ce8531ed848b8b