Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be631484693ce62…

MALICIOUS

PDF

77.2 KB Created: 2021-02-16 20:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d89dfae9c53e10a14ee7cbbc0f5db4e2 SHA-1: 250367d396f58bed90bd14051f09456ec3e5cf11 SHA-256: 0be631484693ce6263dfa9ae7c2618780aa3cb75e61ddc7f2732bce3151b2be6
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'druttle.ru', which is likely a malicious domain used to host or redirect to a payload. The heuristic 'SE_DOWNLOAD_BUTTON' suggests a lure to trick the user into downloading something, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=real+book+6th+edition+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480758/normal_601359af4ad2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ff3ea61302e4.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/e4Khjaw/christmas_picture_quiz_with_answers_printable_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fdd6255aabb4.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/he1idgd/6238674004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_6025d5877ef2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405414/normal_5ffb13b7c7c68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5ffb05ecb6d0e.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/ij5gfjf/75821494339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fdace9f88007.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/pjaxOgc/phone_number_for_minervas_in_sioux_falls.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/jjq5hcg/free_online_games_to_play_now_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/jhNyWJI/application_wish_pour_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/jdhgBVC/41715238388.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/b4Cajjb/cat_warner_famous_birthdays.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_60059de793906.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/posufij/samsung_j730g_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gerudo_valley_piano_duet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/papuvijovajekejaza.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/10044638337.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_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5668 bytes
SHA-256: 5f26f64fbf4c05e538888f25267d14e9b1dae27f4b03c3b6c21047417bf1ed41
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 12412 bytes
SHA-256: 6e9edb2be3a95d8feb1ed7307ddb16af17b1b05a3ff1842f88d5a2576f5c381b

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