Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acb2f3a4e8a23d6…

MALICIOUS

PDF

81.0 KB Created: 2021-06-06 13:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5eea26457e7a7ac69fa45adfac7b715 SHA-1: cab745eba835343e7026cf475744421200eb49e7 SHA-256: 9acb2f3a4e8a23d6644f60072915ea16e8bd7885d790659a78cf5fa9c724a6ac
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://wastran.ru/pbw?utm_term=charles+lamb+tales+from+shakespeare+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144485064/11857442723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2efd74b-450d-47a0-a5bb-f3284a956e5e/apc_smart_ups_disable_green_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76793ed-fce8-446b-bd4a-f362b3e07804/can_someone_see_if_i_share_their_facebook_post.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144506886/30558820065.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/f/38479269022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f31cfab-d132-47aa-a4fa-60b0c4a7a0db/joe_defranco_training_program.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/f/bekatukolidigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d600b4d4-d4e9-450f-a92d-5357a3a9fafc/metal_gear_solid_3_ps4_reddit.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144677868/ark_nitrado_baby_imprint_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79edd97-aa7f-493c-89e5-57ad3ba54b46/whats_the_best_app_for_driving_directions.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/79014854242.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144479649/96006035611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de94d1b3-c259-46a9-816b-f3774523a9a2/vaxanavekadeduvupa.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/oaktopus_secret_like_my_singing_monsters.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144607095/76353238622.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/disedifedoguzodepuwefiriv.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144598722/nobulikoxawamodup.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426621/tinubajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9576063-3d85-4abb-ba31-4954a02c39ac/harry_potter_y_la_orden_del_fenix_salamandra_amazon.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/download_100_000_us_email_list_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf04ed1a-1947-4f17-bccf-cdb6d930f7ae/kiwaz.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/toregapu.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144697422/81682569303.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144525486/lovomawofara.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5140 bytes
SHA-256: 09227c0260eb04de6a1b4da8c76a40f45fdfbc36703f728a53d5b925fa7f163d
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 10628 bytes
SHA-256: 04b846036c8d649e85f5726a0f0a4784185b59d2a684b60ffb70f9c5c3d777d5
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e