Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b5c5c41b495b62…

MALICIOUS

PDF

75.8 KB Created: 2021-03-22 21:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7b48e7d4c1c40b2f6d22889f79486efc SHA-1: d73643a844b17d362489ee1c3f7cab3862d279eb SHA-256: 79b5c5c41b495b6276293bbbd3ab1eab1a3779d125c1964584c03aea8715ab32
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=cahier+seyes+petit+format+96+pages PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fdc0bccc7636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_6041550c90895.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/aGPugfr/entrepreneurship_development_important_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_601270da2ccb2.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/9ha8I0S/16173333414.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/J7ja2s0/gangs_town_story_action_open-_world_shooter_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/4Yvgdjc/nike_run_club_app_apple_watch_not_working.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/23277039961.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/kowamusofosalija.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/58221706075.pdfIn PDF document text
    • http://gavokofubafixi.getenjoyment.net/dibujos_para_colorear_de_frozen_para_imprimir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_f8d726324b9748a4b1106ff2b2f2d87b.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_8c94802d9cc845ee90d8d0b8bc24f961.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79054028-f243-498a-b7b4-4aceddd79d1b/how_much_is_a_sonic_mini_blast.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_fe37b00de0134a1fb4634713642da19b.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_9dee713f9d594a58b3772b35f06b6ca1.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_9259265174384632a4a7a920442f6fdc.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_2a3b7042657845b2a9039184d3ea954b.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_fe91c614119440cea9f4fae32946b6bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bf904f-dd46-4b36-b4de-951aae442192/49355486698.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_504b5d2603e74c2abcfb6533352dc17e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d005db3-5393-4281-b558-859fb57d3ad4/84432021441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4597bf-d11c-49e5-8a28-e550452d48b1/dirt_devil_power_max_rewind_pet_bagless_upright_vacuum_ud70187_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf16df8-bdd5-4ae0-b103-c92b3ce234f6/smoke_alarms_keep_beeping_uk.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_727e241376504a1d887e16a5ef6be9cd.pdf?index=trueIn 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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5600 bytes
SHA-256: 0d6d7a3b1401fab701fe2474d472dfb13a7236e264ee66b1a150f5c0a7eb8dc1
font_01_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 12212 bytes
SHA-256: 1da7344535368813c889f8ec32978612f471645577dcb052c2a3939e15bc63f9

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