Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59561fe219565ab…

MALICIOUS

PDF

71.9 KB Created: 2021-06-08 09:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 18a0e7c6508b087f46eb893770accf6a SHA-1: 2aa5e38c3d729116a5d967318612d74ab78db635 SHA-256: c59561fe219565ab3879f2b73dc6ef33ac76c5269b975037e25443a3ccd81c04
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=download+anime+strike+the+blood+s4+sub+indo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5fe8737b1bc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_604e35eb1a559.pdfIn PDF document text
    • https://moxolodoxezem.weebly.com/uploads/1/3/4/6/134678964/tuwaruji.pdfIn PDF document text
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/fuzabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_602982b3763f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_601839510505c.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/2187433.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/tosolodina.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/ea1e5fd9d97fab1.pdfIn PDF document text
    • https://zetivesitufewe.weebly.com/uploads/1/3/1/4/131438305/sirax.pdfIn PDF document text
    • https://nemotepazifoki.weebly.com/uploads/1/3/0/8/130814284/a499b5dec92e.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/594af888-72ad-410c-867d-fcbd29d6ba40/clases_biblicas_para_nios_cristianos_de_6_a_8_aos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b9e773-313e-46ab-bfd9-f4fb8ed69862/walmart_black_friday_tv_tcl_55.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808f5c22-892b-485a-a6b5-36166eeaa23d/semirike.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/ffg_star_wars_rpg_talent_trees.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/what_oil_to_use_in_honda_eu2000i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22bc0b3-261f-4438-ad97-b34a7118ca4e/halo_bassinest_swivel_sleeper_directions.pdfIn PDF document text
    • http://pebolokunaz.pbworks.com/f/renewal_passport_application_form.pdfIn PDF document text
    • http://zukitisa.pbworks.com/w/file/fetch/144773076/20099756339.pdfIn PDF document text
    • http://finebov.pbworks.com/f/wejiruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0527645-13ca-4086-b556-b53ff6974814/comparative_grammar_rules.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/how_do_you_copy_from_a_protected_excel_sheet_without_password.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/how_do_you_spend_your_vacation_essay.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 5448 bytes
SHA-256: d6804c7f1220da7c05b988f8834b436c9a0af9a973a4f9361a6c1ddcb41870b1
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10776 bytes
SHA-256: 1ca7417919c146de1618e36624bbfd02df9c9be36e29919cd7d6af482ea40980