Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4a753861c4369b…

MALICIOUS

PDF

93.0 KB Created: 2021-03-30 13:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7768a982c3eed73d10f9ab6a5fd23114 SHA-1: a24c45f6709777cdf6438705093e0d674632f397 SHA-256: 5a4a753861c4369b3eeb94f1b520aa3ea2ff09b8b3993ab3777fbb97ee65bd80
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One of the primary external URIs, https://botokaw.ru/strik, is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=movie+maker+online+free+editor+with+music
    • https://cdn.sqhk.co/jozazixefuf/0Pnjaib/wild_bunny_running_in_circles.pdf
    • https://cdn.sqhk.co/xokebuzizo/hhidTOZ/white_tripod_floor_light.pdf
    • https://fibigator.weebly.com/uploads/1/3/4/3/134313363/jijutubewox-wosojuxumezi-wesosiju-mimutopijosed.pdf
    • https://cdn.sqhk.co/nogedapuvul/aNhgij6/lozatilagetop.pdf
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/a2bf9250bea446.pdf
    • https://cdn.sqhk.co/jenireni/hbIdhij/39011005254.pdf
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/fiwenudune.pdf
    • https://cdn.sqhk.co/redixebu/SiGggm1/free_photoshop_action_pack.pdf
    • https://cdn.sqhk.co/zezegawutogu/fhd4igJ/kafesakanelot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/80cd25d6-e508-4995-af2f-2b946eae7599/56224683263.pdf
    • http://tukudapig.epizy.com/arduino_cc_guide_home_page.pdf
    • https://uploads.strikinglycdn.com/files/66fc4c4d-9267-4175-af3d-19d36d2ae438/why_is_orpheus_important.pdf
    • http://minofadejewezup.rf.gd/autocad_book_download.pdf
    • http://wizunanaxenuxi.rf.gd/context_clues_worksheets_for_grade_4.pdf
    • http://getozareburi.rf.gd/tuneriveju.pdf
    • https://uploads.strikinglycdn.com/files/03baae5c-87ae-4e85-86c9-4967ed64a599/how_to_change_a_braun_ear_thermometer_from_f_to_c.pdf
    • http://vamafawuf.epizy.com/how_many_calories_in_a_dunkin_donuts_iced_coffee.pdf
    • http://wesukudepabu.epizy.com/courteous_expressions_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/62092297-a0e8-42a9-aac4-92f6f4cb8c66/what_is_an_rslogix_5000.pdf
    • http://fasadokejofis.epizy.com/sivuxipumivipagi.pdf
    • http://pisasegobure.epizy.com/fejajanid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f6c.bin
e5c0376560dd67e84113dc7ffe9dc582eb3413427e6378499645ce77788dc0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 5364 bytes
font_01_sfnt_off00013198.bin
70ef68692ec553c149bad0c0fb6ce2741c3b055dcbc73a319ba8fef734c51e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 11276 bytes
font_02_sfnt_off000157e4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157E4 4324 bytes

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