Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d6adc376e3ad1c…

MALICIOUS

PDF

74.3 KB Created: 2021-06-04 02:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3590719323ca70239fbcff4ead858dc1 SHA-1: 518a3dde81342864f5e8b0e68a6fd5232d03eec2 SHA-256: c5d6adc376e3ad1c9151b59b81505494d8640e7fd7f4abfe595d555fd004a2cc
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 0.9991

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://chcial.ru/pbw?utm_term=what+is+business+canvas+model+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454821/normal_6026494ee1fc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_60031e54663c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5ff1bb90c33fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_600dd3d95ae3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_6059274e265cc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404524/normal_60b365b0d6e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_604fa727557b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_6054bfc400e8a.pdfIn PDF document text
    • http://ThePourquoiPas.comIn PDF document text
    • http://my.bio/adrienbookIn 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/23e5cfe6-4b14-4da3-802d-c730f19f7732/10_generation_family_tree_template_excel_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1751d32-63a0-40da-8efb-c566d1ba5b5d/fudge_a_mania_book_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f55033-2e39-4f17-a060-f1193631d4db/world_of_darkness_combat_marksmanship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46028deb-f8dd-4cd8-842a-cc982aca1151/84057059679.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/political_science_optional_notes_by_shubhra_ranjan.pdfIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144464982/los_cinco_minutos_del_espritu_santo_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434d23d2-ee36-49fd-9f3d-5c05fd78da22/navien_tankless_water_heater_240a_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf693bd-e25a-4e10-85df-e3e275c4e022/54172084067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b46d77-affa-4c6f-8cc3-dcc6d4edfd44/4373735713.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/what_is_the_answer_to_impossible_quiz_2_number_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8126459f-77d4-4524-9368-367068c152ba/mole_concept_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6c1acf-c368-4f04-b04b-b283e52ccb6b/96761897076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f164890-4a6c-4a2a-9b73-b03575d9e479/how_much_is_a_2_zone_monthly_bus_pass_nj_transit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/969e121b-9792-4b05-92ca-28bbf57a2c02/56440389714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3028d55-650c-467c-8e34-4aea989777e1/contrato_de_arrendamiento_de_vivienda_en_word_sencillo.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/megel.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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 5512 bytes
SHA-256: 65784e0b4b4894c5300c17408a9f55de2836773b86bd6cbc2acb5730973d47bf
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10428 bytes
SHA-256: 7b6a0b842859bb0b85585e7f2fbd8f77bc213adece37220b086165965968696e