Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cef5bf3a73c3f3…

MALICIOUS

PDF

92.0 KB Created: 2021-03-30 12:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 64e556234351b6e93c610003999e480b SHA-1: c8a8acc644fe35961e64cc97bfd2692e927d4bbb SHA-256: 23cef5bf3a73c3f34b46ec40b646769cc25529576582ed2ef156c56a36f6a152
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection, specifically identifying it as phishing-related. The PDF contains an embedded URI and an image lure that redirects to the URL 'https://bologen.ru/award?keyword=carburateur+voiture+pdf', which is likely a phishing or malware distribution site. The document body appears to be malformed or obfuscated, but the presence of PDF-specific heuristics and the external URL strongly indicate a phishing attack.

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://bologen.ru/award?keyword=carburateur+voiture+pdf PDF link annotation
    • https://cdn.sqhk.co/wesifarajaru/IhbSUjj/44717248190.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/h7hdj9O/mi_home_security_camera_360_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/hShg5QE/hide_seek_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/hfhjcic/feudalism_short_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/gdgdjiI/mathematical_reasoning.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/fLhesgj/add_credit_card_reader_to_vending_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/idgg3jT/furious_death_car_snow_racing_armored_cars_battle.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/gfijwEX/94776678806.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/wuvepilamamuse/350399609.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/12630820494.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/vudadigafux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9c6749-3046-4cc4-84eb-786fad4a6dbe/hp_p3015_fuser_film_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1f184b-5efc-4a9a-a4e3-23f55bad4196/dopujof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ef80f5-9ab9-4bf6-b4f5-907ab55fadc8/10642790968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c15ce1-66f0-420c-81be-83858d9e30b8/93041356854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27aee1ea-61ea-4b84-86ca-35d34e4af029/venn_diagram_questions_for_rrb_ntpc.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/avidemux_2._5_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/buseradofuwawibemu.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/71442022667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af64dc31-786f-4fa1-92d3-416c3066a3dd/76991878392.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_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 4932 bytes
SHA-256: cea5b553fb12c23301e34d96f69a8f23b8bf8b4bc2f80eadfae55dcbd04cc136
font_01_sfnt_off000139a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A6 12744 bytes
SHA-256: 52c9053885f2f629becded1d55aaf4eb7c4d4349c1abfd76a4bc4fb5ae713895

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