Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65bcad6f752af2f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-08 09:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8042e630b1f1ff876c1d6c4c4e0a0297 SHA-1: c7caca19bbb6f299cef5903d225f0816e8e328ac SHA-256: d65bcad6f752af2ff7cbe71385345a757ebac7953493db087a0166d3fb56cd4b
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. The ML classifier and ClamAV also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to deliver a secondary payload or lead the user to a phishing site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=papa+johns+qatar+menu+pdf PDF link annotation
    • http://zajilakofudo.scienceontheweb.net/bharathiar_university_syllabus.pdfIn PDF document text
    • http://itfamily.pro/67588111319csg0y.pdfIn PDF document text
    • http://fitdieta.com/volkswagen_eos_owners_manual5kcfi.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/datasheet_arduino_mega_2560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://domebiwek.myartsonline.com/human_impacts_on_hydrological_cycle.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/paxuje.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/mefabotobo.pdfIn PDF document text
    • http://jopubijako.atwebpages.com/pegurigow.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/lepari.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/mifeje.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/angel_care_baby_monitor.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/bleach_brave_souls_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/pegidor.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/43962934078.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/rustoleum_cabinet_transformations_vs_paint.pdfIn PDF document text
    • http://dafukip.myartsonline.com/79564838785.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/35228882834.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/57369985294.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/dizunisemowatuvilu.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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5452 bytes
SHA-256: edefe3c67ca717a6fc08944d651151090a8a357e77ef103729b41645342578f1
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 13920 bytes
SHA-256: d6a8018b426deaa03c27fd5ef720811984d8591586f8607fcae1070be65fce57

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