Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b645449146af11b…

MALICIOUS

PDF

71.3 KB Created: 2021-03-01 16:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 94614cc48c75668e62bc8423c1c62d01 SHA-1: 38d186ba29e0418fc2bb83ce7d046d646e8e527e SHA-256: 3b645449146af11b90e452693c9ac29a4fd2188219e1549fbbd2bb07dccdb2c8
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. The embedded URL points to a suspicious domain, likely serving as a lure for users seeking a book download. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=libro+evangelios+apocrifos+pdf PDF link annotation
    • https://cdn.sqhk.co/mafozerekat/jbxBGgi/traffic_racer_online_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/tl9vjin/word_search_puzzle_books_large_print.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5fcc04baa22c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6021510ff0582.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/ebQvygf/silicon_valley_techcrunch_disrupt_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/biajg3z/dragon_translate_japanese_to_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betesemimototi.rf.gd/cesar_millan_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/stalker_ray_of_hope.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/vba_set_active_worksheet_name_as_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/vokezutofitar.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/virtual_lab_activity_series_of_metals_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/18418808619.pdfIn PDF document text
    • http://rekalira.rf.gd/the_lion_and_the_mouse_story_in_hindi.pdfIn PDF document text
    • http://lonivone.rf.gd/airplane_games_app_apk.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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 5464 bytes
SHA-256: 2260bc852ede164d3ac886bbf52ab2c57d65be8c2988e2cbe4935136265f3717
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 11892 bytes
SHA-256: a6c12a26104b7f4f51d8df874d599e2561fb1d892ed82681b3b1cf6339f9c0f1

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