Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace42a9c53f2e6dc…

MALICIOUS

PDF

69.8 KB Created: 2021-03-22 01:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e3fb15c33b8f78d73bd80c8c2a9b1784 SHA-1: 31a809c79eb4f986e785792a2473b5989adfa4e1 SHA-256: ace42a9c53f2e6dc4fe9efc680662121672e86c70725a410c888dfec5bb7c423
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains an embedded URL pointing to 'vilenefex.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'Infant benadryl dosing guide'.

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://vilenefex.ru/123?utm_term=infant+benadryl+dosing+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428078/normal_6020aae10a07f.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/ypiejeA/wheel_of_time_swirling_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/hd9qiar/v_moda_crossfade_wireless_2_codex.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/aQRCYW8/rolling_ball_game_3d_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/hjjijju/ladies_vintage_rolling_stones_t_shirt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_6012dd635ab7f.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/hitmIay/parkour_map_seeds_for_minecraft_ps4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fddc5a43ad35.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/gYAAiiq/laneige_fresh_calming_trial_kit_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5ff120752a7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jDCjcXf/cookie_cats_pop_scoring.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/dovulavavo/93786955674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78dd22cc-dfaa-43a1-b0f9-3d3a60afe5f7/dialectical_behavior_therapy_define.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb993cca-de60-47b8-9e07-d3164a19a16a/88442592874.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/scientific_calculator_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/modern_commando_action_game_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0f2e45-9142-47f4-8734-a211b9b0691c/www.gohealth.com_admin_america.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/45353197095.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/lufaziwefafivuzafoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f865d540-1132-4e6b-8a1f-7d8c069d18fc/dituxatikexirug.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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 5252 bytes
SHA-256: 502a898a8da64cd1767fa551dbf47394816c27a534f59d9c5222b720d88b89ce
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 10540 bytes
SHA-256: facbcaa2e2cea250ed8070f9ae8f1bb54ff42c41bc302f076feda986ad422d4d

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