Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fbf9387abca463…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 12:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2aa0635fdca329c0bc5422a33f214ce4 SHA-1: c27d58a4f7c0a8b60ca9641f66a0be106dca16e2 SHA-256: e3fbf9387abca463ab7f3066bcb007c16e0a7bde7f701c117fabc45ece822ec7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to 'quantitative analysis of market data' and an embedded URI pointing to 'kuzutuzo.ru'. This URL is flagged as a high-risk redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=quantitative+analysis+of+market+data+pdf PDF link annotation
    • https://cdn.sqhk.co/tomubozes/aigLDii/34670464010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fc8de29a352b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499299/normal_60411b40563b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_605a2c58a8477.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/ijEjbEJ/soccer_tactics_board_game_dragons_den.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_604a9f361e9fc.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/Fuvhiij/98710930926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_602474e95f742.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/xjc0Chg/off_road_motorcycle_training_scotland.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovujopojat.epizy.com/bluetooth_headphone_for_android_phone.pdfIn PDF document text
    • http://satekivu.rf.gd/safety_data_sheet_for_general_purpose_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/97177714653.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/zoxumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb67eaa8-8c27-456b-a15d-460969bffc9b/two_advantages_and_disadvantages_of_glycolysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/beadboard_sheet_ceiling.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/puzopuwidajarunixabawala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ed37ab-7028-476a-90ba-05d0f0facd90/excellence_oyster_bay_jamaica_excursions.pdfIn PDF document text
    • http://nogobixa.epizy.com/95018503576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e76e7e-537c-457a-98c5-60a2f41e4e57/sijunebenitefur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d060fd37-e99f-4ac7-9bfd-6948865151c5/firapaxibamasadole.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_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5472 bytes
SHA-256: b1f17d780cd120bf512de422edf5907cabdddd884adc73966784eedc2977c4f8
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 10604 bytes
SHA-256: 71d338516718ad3f552b5eb5381899f927538e36a0e0f61222d8e3ffb9a65d21

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