Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e0832f3f2d4a41…

MALICIOUS

PDF

72.6 KB Created: 2021-03-29 10:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fec988ca99720c4734cb72b759278e59 SHA-1: 2f2342cfc465f189b3b539d86f1dff06eb0d44bf SHA-256: d8e0832f3f2d4a41b29ffc71bbe2b4c5f625740e0d66be5487119dde8667e966
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains keywords like 'Powershot stapler 5700m instructions' which likely serve as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=powershot+stapler+5700m+instructions PDF link annotation
    • http://help-business-media.com/19383485146cgku0.pdfIn PDF document text
    • http://tiktoktop.design/fodezoliux0ad.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/baby_groot_dancing_screensaver2t1b4.pdfIn PDF document text
    • http://prognoz-football.club/how_to_activate_speakerphone_on_panasonic_cordless_phoneh1ghn.pdfIn PDF document text
    • http://vodoroding.info/ascentric_platform_servicesj37ko.pdfIn PDF document text
    • http://afracheat3.xyz/township_game_cheats_2020pw3ko.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/bovenotojitowe/scala_rider_g4_battery_replacement.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_962694c3876f40828a070cfc6d252317.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ffd621-9ad6-4e82-b33d-94ecaa6588c8/how_to_get_your_fire_stick_remote_control_to_work.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/13817517734.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/daxujoxeton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b2d786-680b-46b0-bf90-381c602672dd/to_eliminate_deferment_abuses_what_did_the_selective_service_system_do.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_9a05d48ce05b46a785c5036114023932.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ea453f-b3e7-42f4-a595-ebf59d194503/jenogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c81564-8454-4f67-b168-b12a36f547e1/88831902253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0f7d1c-88f1-41ad-8228-6380f7c8201e/22699476633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3b1546-299c-43b5-872a-51b071023a2a/cloud_security_engineer_salary_canada.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_4384c6def4584c4fa0f882c510c3c8ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b39137-3e5b-482a-8a00-45abbaada554/dixafipevosijimora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4890ae6e-0493-42dc-af47-d826fc23cdd0/one_punch_man_anime_or_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6767d1b7-b68c-432b-872f-4c8d1a35f5a7/canon_mf4450_printer_driver_download_for_windows_10_64_bit.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_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 5612 bytes
SHA-256: cd882942fb1795abb68e864c527f6a1244084afb65f06f4d1c799f3d5fe2b85e
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10264 bytes
SHA-256: 3171869c2481912be983e6b75c3470db4d0192cb4c994b5a7e29ad98b79ef7cd