Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ffd4e31ba7010…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 22:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c3b88a821d4b1cc0691ecb4ccf0c5153 SHA-1: 8e5e71c0ffa14e32f77b4a1ea44906acdfd9cf58 SHA-256: bf9ffd4e31ba7010a57de15f58f7c719aeff8d6292d0b271595c508cfbbd9b0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://leonvi.ru/123?utm_term=baby+boy+shower+card+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501214/normal_6069bff3d62d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fd3cb0809085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_602305ba46ee0.pdfIn PDF document text
    • https://cdn.sqhk.co/powedaguja/DCmggpJ/crazy_celebrity_stylist_girl_fashion_and_makeup.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/ibhaMib/2020_super_snake_truck_price.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/tnau_study_material_for_b._sc_agriculture.pdfIn PDF document text
    • http://nukowivoxom.iblogger.org/gooners_guide_football_predictions.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/stock_market_news_live_india.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/ijiXU8h/amazon_driver_uniform_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/cjNibhb/moomin_pop_bubble_tea_bar_ari.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/merikugupeniro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_c663c80f6627497e8bd0b5b71aa7cc27.pdf?index=trueIn PDF document text
    • http://tewidunutazi.rf.gd/crbsi_prevention_guidelines.pdfIn PDF document text
    • http://teruwizirazi.rf.gd/wizikozilun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d17f4f7-41e4-4c10-9b26-76c8ba56ea3f/how_long_is_the_2_harry_potter_movie.pdfIn PDF document text
    • http://fenutirumavilo.epizy.com/school_budget_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e110a9f-400d-4dbf-a96a-b6604d5618f3/nusanipat.pdfIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_2b3c5ac705334173852c6c2e49e6e1e0.pdf?index=trueIn PDF document text
    • http://dukowuvizo.epizy.com/salaxoragafuxutisuka.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_d8966712f15d4718bff5dce68b344059.pdf?index=trueIn 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_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 5696 bytes
SHA-256: 4a933a33c157c94645f2bf204547040372f77f387035bd91e0d087cf5e6e8bbc
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 10844 bytes
SHA-256: 3d9eb65f4b7bfbde63db67d281be940c8c3afa1b45d43bb93f741487800a8cdb

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