Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9da6ee648a143d8…

MALICIOUS

PDF

74.3 KB Created: 2021-03-27 14:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3c624b34ed937e58eb139776fb3985c6 SHA-1: 1be0a7014e28b49eec8b262b2fac7ec09143b61d SHA-256: c9da6ee648a143d82984b1203931abfb44a3d462ff1bfa354eb4a635bdde67e8
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a ML classifier flagged the PDF as malicious, with ClamAV confirming it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'possessive pronouns worksheets for grade 3 pdf'. No scripts were extracted, but the primary attack vector appears to be directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gimoguvi.ru/award?keyword=possessive+pronouns+worksheets+for+grade+3+pdf PDF link annotation
    • https://cdn.sqhk.co/ribobujir/iiHQRrK/94095524254.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ezPZsib/62730835230.pdfIn PDF document text
    • https://cdn.sqhk.co/refuvowur/gdvVema/weeds_cast_season_4_episode_9.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UCgighh/6100673381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aaca84-952c-43a0-8705-770875a60b32/wawuguxevilapuvegijowuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/ashton_sanders_agent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7055696-d17c-469f-a8a3-77de75473c16/weider_ultimate_body_works_incline_bench_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6160aa77-87a9-4ff4-8898-fb5789cc2d4c/58285967752.pdfIn PDF document text
    • http://nikejubefip.epizy.com/xabagakelab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190e628e-c35b-4375-83fe-3835c17debee/how_do_you_bypass_a_whirlpool_washing_machine_door_lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3903b44c-d43f-4def-9307-c70ba11883d7/logitech_k400r_driver_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/wogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/vebikafananuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f98745a-09d3-4ca9-9e90-d1ed6c4a3b62/argumentative_essay_topics_for_middle_school.pdfIn PDF document text
    • http://zedaziwubisod.rf.gd/kufejajeleriki.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/how_to_start_a_professional_sports_league.pdfIn PDF document text
    • http://mivuturirem.rf.gd/does_dell_latitude_e7450_have_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/nerisikopupelesubugiped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6889c236-be2e-4a82-bc8d-7dcf76442556/friedrich_nietzsche_philosophy_of_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/arjun_r_meda_video_song.pdfIn PDF document text
    • http://nibedob.rf.gd/weight_watchers_points_list_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0fc069-f13b-4cee-afe8-5ed02751ba01/49038312160.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/vasipuvekapilop.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/72221015225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3995e8-93bf-49f0-817b-e8879074bef8/the_hermetica_the_lost_wisdom_of_the_pharaohs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/tata_sky_plans.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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 5652 bytes
SHA-256: dab77c21ced6ccdd4eaf815287ec05fb724fef21a419c6be9797ab3670777031
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 10780 bytes
SHA-256: 78b7b58d8bde9f57c9679d52521e19e4946c694a10d55c8af9858ab8120cb693

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