Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f0baa4a3c0d74e…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 02:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2eedf709b48fcdca8e19c7956a7c3fa7 SHA-1: 27c2e02f9727e00abbf268c227b2d01b6081681f SHA-256: b3f0baa4a3c0d74ebf7ee5b3fb8a2cee49ddb4b7ae07cb17eb74c0eef2e6deb0
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a malicious payload or conduct phishing. The document body is heavily obfuscated, but the presence of the external URI heuristic and the URL itself strongly suggest a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=biddeford+blankets+washing+instructions PDF link annotation
    • https://cdn.sqhk.co/jujadiziga/hg1EYib/masike.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/hggdSDW/download_sausage_wars._io_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/iidiox8/taptap_apple_store.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/hgdhftb/kiwisexaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5fd82d3cb5acd.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/7fgehHd/the_midnight_game_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/qxDjchc/lonajodilumewugowusemurez.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/ibz7sgc/tribal_leader_crossword.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/SjerWjd/htc_backup_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/qZij8jj/46703702759.pdfIn PDF document text
    • https://cdn.sqhk.co/sanozusu/fhisAae/pew_pew_pew_song_clean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_60336e46a6280.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/65f2e775-790b-4ce2-a872-8f092d2efc65/remington_700_sps_recoil_pad_sticky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38d0c28-c037-499a-96ad-d05cbde45f0e/calligraphy_free_ebook_download_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/2021_coleman_lantern_lt_17b_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/cargador_de_baterias_duracell_is1000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d5b0d9-5cb7-4a79-bb95-3aa3e2d28b21/anglo_saxon_riddles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b590ea76-8d65-4e24-bbaf-fcc829876892/dunkin_donuts_blueberry_donut_holes_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed59a59-2ddd-423c-9713-7321054100dd/car_form_lra_revised_6_18.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/toro_sprinkler_valve_wiring_diagram.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_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 5628 bytes
SHA-256: a51adb35ecc0288d5355f5d7d2a3b9d9b46bf965c6d0b20361b2ae95826dec9e
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 10792 bytes
SHA-256: a17639a6938e5622cf1059335429f407307564f2b53e063ecc1c269864931cd9

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