Malicious PDF — malware analysis report

Static analysis result for SHA-256 36913df3d1dde294…

MALICIOUS

PDF

92.8 KB Created: 2021-04-12 20:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f60340d7809ff49fee2b13b6713812e1 SHA-1: d70fbde9a6509bb2782fdd53dec2e737b3c58af0 SHA-256: 36913df3d1dde2945241b11c2c152dbf3313d11c0edca23757d3142868878819
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://soxebez.ru/strik?utm_term=what+are+the+symbols+for+army+ranks PDF link annotation
    • http://tujemet.scienceontheweb.net/tiwasavam.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/12792951756.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/84524815857.pdfIn PDF document text
    • http://susurrus.space/authenticity_50_percale_sheet_setatdr9.pdfIn PDF document text
    • http://titoto.xyz/learn_r_programming_language7ga6o.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/10851916104.pdfIn PDF document text
    • http://getsalle.xyz/gepijefemik8fk2t.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/98049769524.pdfIn PDF document text
    • http://akmurzina.com/vivezoribolajoturaliponi96gy.pdfIn PDF document text
    • https://cdn.sqhk.co/nowegizin/cvjdcgf/pacsun_cyber_monday_coupon_code.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_draw_a_face_with_charcoal_for_beginners.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/22280791190.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/pancreatitis_diet_education.pdfIn PDF document text
    • https://cdn.sqhk.co/deliwewofok/H0jjdge/flag_foreign_law_guide.pdfIn PDF document text
    • http://sandwichhq.club/20529320240b2p8c.pdfIn PDF document text
    • 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://bufijonewufo.onlinewebshop.net/nespresso_capsules_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea58526-b502-4e8f-b558-097efce6b3d6/pawedizoboterolus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4f65bd-ddb8-4b2c-91c6-9dca91cbbbe3/nerog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28fe7a0-815f-4b54-a25d-ca8297f577c9/85961896908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e926210-41da-4886-8694-5a8f27526306/how_to_calculate_difference_between_simple_and_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f46664-7850-4915-ae4b-ee21fe4574ca/what_is_medicaid_transportation_phone_number.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 5064 bytes
SHA-256: 61be615e4da4a4978dae6da306f2b86fa581b2760eaa7f9cc9a9f2bce699bf0c
font_01_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 11128 bytes
SHA-256: 6bd9cd1c9c0d487086b4bcae2168f77a1603823da7d0f09e313a41fdda2f4ec9
font_02_sfnt_off00014219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14219 16088 bytes
SHA-256: 55ee31f2b9c575572aca401957c5cf2f3b57b55b1dd57d1bb6d1e144d3512b41
font_03_sfnt_off000156ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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