Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7bbf91ba69cdcc…

MALICIOUS

PDF

70.1 KB Created: 2021-02-11 22:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2d9bdd790aaa25310c03f6e94399182 SHA-1: 465048604e8220094bb9dcd9ce71c855cb2e0fd1 SHA-256: ab7bbf91ba69cdccb2a9b66b902669c7ffc459dae736239125caf661d5252b06
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, which is likely used for phishing or to serve a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to 'Gattaca biology worksheet', indicating a potential social engineering tactic to entice users to click the malicious link.

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://leonvi.ru/wix?keyword=gattaca+biology+worksheet
    • http://starconflict-game.ru/11900845093f9ub9.pdf
    • http://wowosuseje.22web.org/service_electric_cable_guide.pdf
    • http://janurikemodowu.iblogger.org/luwurol.pdf
    • http://kostlike.site/56628445413alpv1.pdf
    • https://cdn.sqhk.co/sofizagumup/jekTKif/11592192624.pdf
    • https://cdn.sqhk.co/lukisebeka/Rjbryfw/snapping_turtle_eating_pineapple.pdf
    • http://visatog.22web.org/quizlet_apk_android.pdf
    • https://cdn.sqhk.co/tajixixejafi/jbsZQjc/the_ben_new_song_audio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wasalesex.epizy.com/classified_ads_website_template_wordpress_free.pdf
    • http://marilineme.epizy.com/75590456517.pdf
    • https://s3.amazonaws.com/dinisemowoge/moses_prince_of_egypt_movie_worksheet.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/gamozokijinubazorori.pdf
    • http://bomigezi.epizy.com/atresia_esofagica_pediatria.pdf
    • http://wenimawibi.epizy.com/general_pathology_mcq_with_answers.pdf
    • https://s3.amazonaws.com/samopakamefap/37094619691.pdf
    • https://s3.amazonaws.com/gomakobez/casio_fx-_991arx_manual.pdf
    • https://s3.amazonaws.com/vuxirefare/new_kprc_sports_reporter.pdf
    • http://vugokaduliro.rf.gd/pebuxuraki.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_off0000d4be.bin
8a78a909f5a1e2d62ea3726ca1a2b47bab34f2cd4709280198f06ac2614669b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 5488 bytes
font_01_sfnt_off0000e77d.bin
107490d6f4e936cdff2fc5603628794024a665991171d8199b4af326d8ca7702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10524 bytes

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