Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbb9d6e3da8a99c…

MALICIOUS

PDF

75.9 KB Created: 2021-06-04 13:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6902e6042424031f114023917cfe3237 SHA-1: 7209ed8f3e69b8f310f5381f134212ed14599f95 SHA-256: acbb9d6e3da8a99c548854f9602245166b216580e2eec5a1e0c88f2981b0c5c5
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 0.9990

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://catamma.ru/pbw?utm_term=what+information+is+on+a+california+driver%2527s+license PDF link annotation
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/wixob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_603400b0e8cee.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/2ed8f70d8986.pdfIn PDF document text
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/0f813a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417827/normal_5ff8b800ea83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_6023b37732c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_605164a521a1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurutaw.pbworks.com/f/can_you_get_builders_club_for_free.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144571578/30085774747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d87b07-e1cb-429e-b9f5-cd6520cbee70/how_to_clean_jenn_air_cooktop_filter.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/what_will_be_the_cost_of_ps5_in_india.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/rozeredowosazizeparigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ae7206-3cb4-412e-ab3d-fe411283904a/discurso_padrino_de_brindis_15_aos.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/zotovisazamifawumux.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144555213/how_to_update_cisco_anyconnect_mobility_client.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/46294374083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837e9f7f-dbb7-4531-9dce-e59204d4f5f7/how_to_become_a_freelance_graphic_designer_without_a_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f1aa41-5423-41d8-ae5b-8b2bab5bd71c/thule_roof_rack_installation_guide.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/mmc_de_polinomios_exercicios_resolvidos_8_ano.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/is_phenibut_legal_in_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bb2fc4-b838-4c48-aa81-3d9274f9d0c8/41508662959.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/920931075.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/39985237276.pdfIn PDF document text
    • http://daridameku.pbworks.com/w/file/fetch/144592938/shootout_at_wadala_full_movie_download_hd_720p_filmywap.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144532485/farming_simulator_18_mod_apk_android_oyun_club.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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5368 bytes
SHA-256: 3c57680872e30c57239e56ed930047f43d285d71ca1c65b2edd574d66d47c83f
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 10420 bytes
SHA-256: 2db07a36ddf5b0691a6f3374447cdb8a109b7a83b09ce25c30263fceb6febcb8