Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b5369f53ce3b9e…

MALICIOUS

PDF

79.8 KB Created: 2021-06-01 15:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 526ead0c21428d137cc694994c1d4b9e SHA-1: b28b8006413c97fa1264437b36133f5bceced74b SHA-256: e9b5369f53ce3b9ecbc8fcd2a7e7eebfd6a680e153fe5da783569503d3f072a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/pbw?utm_term=simeon+panda+workout+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392474/normal_60325ded65c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_6005e5623930f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_600fdf1d44210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fe56ea885b17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ffe4f8214895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_6047f99d09790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fffa984e0ce7.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/62bb55b6-18bb-46d9-9268-1431d6653dc3/how_to_fix_preview_handler_in_outlook_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f684bbd0-94d2-4507-bb3f-11513befdd4b/33811491446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62d9a85-bf0d-4d9e-9293-8faa873a88f5/matatetutafafex.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144449097/what_is_luminosity_of_the_sun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd99416-12e8-4273-8303-b2ee01b30eba/scooter_repair_shops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68c1d22-e6e2-4fc4-ae3e-9b059fd2e56b/fonelivaravolerukenugupe.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/how_much_is_fox_sports_go_per_month.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144443295/3797045833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60302a76-7658-4025-9abd-6bdb3024b902/conflict_management_styles_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1435c687-ac8b-48b3-9225-3499202384f3/salary_for_mba_in_supply_chain_management.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/can_i_get_more_emojis_for_android.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423342/strong_adjectives_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2474a872-dcf5-4efe-b032-7c6008c042f7/the_100_best_business_books_of_all_time_free_download.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/diploma_electronics_and_communication_engineering_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df68b14-f69f-4990-a120-cebd0e1c0aad/926537572.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144436485/bigufugidopudaferami.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_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 5236 bytes
SHA-256: 644b13e88904fbfcf0936b17c7bf262016f1c1afea7e1e1bd18fffa878a2ef78
font_01_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 11272 bytes
SHA-256: 2ec4032ee2062cc56744559dc332ccdaf15a7314dc25d9b40a2ec3421f75dc9b