Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff474d91d369fc3…

MALICIOUS

PDF

86.7 KB Created: 2021-04-03 10:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b834188a455448939e4347fc0bd7e6ef SHA-1: d4772354879e2eae6d4f96f825b06d3887a64361 SHA-256: dff474d91d369fc3b7f0bde956590050e9be49914a4497d7b41b590c440fbd7f
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that mimics a search result for a book. This is a common lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution via the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=brian+head+welch+book+pdf
    • http://badoxik.scienceontheweb.net/netopidodubixirekuxazak.pdf
    • http://lajodibibodi.getenjoyment.net/bacteria_classification.pdf
    • http://bekopomulasebi.getenjoyment.net/online_ms_word_document_editor_free.pdf
    • http://ruvujagefeko.mygamesonline.org/aircare_ma1201_evaporative_humidifier.pdf
    • http://duwosolutanuz.mypressonline.com/electrical_engineering_drawing_textbook.pdf
    • http://vonexalux.sportsontheweb.net/newipevepokupoka.pdf
    • http://olipaka.xyz/29034266176ifmri.pdf
    • http://chambreapp.xyz/91839043266scld7.pdf
    • http://bestita.space/599107565872ln8h.pdf
    • http://pimesizawox.sportsontheweb.net/public_administration_optional_syllabus_for_upsc.pdf
    • http://zonitupupafof.sportsontheweb.net/chicco_bravo_trio_travel_system_safety_rating.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ropupifalapoges.atwebpages.com/zefagirixor.pdf
    • https://s3.amazonaws.com/jafujasiwetid/silsila_ye_chahat_ka_song_320kbps.pdf
    • https://s3.amazonaws.com/muvemasoxaji/51979636500.pdf
    • https://s3.amazonaws.com/nigimul/54153304529.pdf
    • https://s3.amazonaws.com/wifiduxezo/printable_letter_from_father_christmas_word_template.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/apple_pie_nutritional_information.pdf
    • https://s3.amazonaws.com/jijari/xavuvof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011582.bin
5846c4dabd3a531eb161ee0a01e62a1cf2bde88ae46f0b38c38cd23f1c943d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 5408 bytes
font_01_sfnt_off000127f0.bin
09ebbd82aaf8edc93fd29c5f6053bf530190d3b432915da3af9b38308d5b87f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 11048 bytes

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