Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa820f52166797e…

MALICIOUS

PDF

95.5 KB Created: 2021-03-30 23:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 231c91ac07b3ba353d00c1d750a39d00 SHA-1: 90f64200a66ad002814a09c838781ed7c326df13 SHA-256: 4aa820f52166797ef683c452b809672cf4b0dbbe7ec358d94b68264cf15e7b97
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'pelibifir.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=incropera+heat+transfer+8th+edition PDF link annotation
    • https://cdn.sqhk.co/giripiponi/FDjNgfr/ps_vita_remote_play_keeps_disconnecting.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Fgchhhh/rojadirevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_60263a0ab813d.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iixPhaD/world_of_monsters_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_60168d24d0b30.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/YrAQifG/luwanefomutowatejuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_60555e33173e5.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/XTDwhcZ/11778162072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5fe056934ef5f.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/gc0QjhI/download_dungeon_hunter_5_action_rpg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fdeda135601b.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/Mceibhh/puppy._io_race_amaze_dog_run_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/hgNmjim/40117718243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_602f5ad255971.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/VihCghd/flower_vintage_wallpapers_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5ff78a1818c72.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/cigiage/xumepu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/07e47fb9-1b0d-4d09-a8e0-c1ef3f33ba76/who_makes_skywalker_trampolines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edee821a-2dc0-4a10-90a3-e6ba44e05dbf/11296194610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7264091-d096-4241-9662-45c9713e8826/easy_sports_crossword_puzzles_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d8b2d9-9bf7-4adb-995c-ea345b1e74f8/votumubagimode.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 5544 bytes
SHA-256: 12aa8b28d814fbfe8a60c4e3f9b8e637de34854b509a4cef8d034746c3346cc5
font_01_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 5340 bytes
SHA-256: f95f44425a8df31da2533276835e525e0242d086618f3a6d70e1ae432aaa4f90
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 11988 bytes
SHA-256: 6b8301bfae2bc6ff6e0ff18db3a0753f1826326ce8c8698e2111c22328519f57
font_03_sfnt_off00015acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACD 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10

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