Malicious PDF — malware analysis report

Static analysis result for SHA-256 8189a60f9df94d84…

MALICIOUS

PDF

73.7 KB Created: 2021-03-16 18:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2911ea32856067d2585957158472699c SHA-1: 94c427ce6dc538a7e72a06efda76dbc5c6a8a35c SHA-256: 8189a60f9df94d84272b881928af2751622a15d5a2dd3fb07d1d687a2887ff5a
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://vilenefex.ru/wix?keyword=dmso+nature%2527s+healer+pdf+espa%25C3%25B1ol PDF link annotation
    • http://zesenadozefut.sportsontheweb.net/crochet_virus_shawl_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_601305013fcff.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/capsule_filling_machine.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/wolves_of_the_calla_illustrated_edition.pdfIn PDF document text
    • http://mejegumojotata.22web.org/43093650558.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/do_i_need_to_notify_dmv_of_address_change.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_5fe635b442f64.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/how_to_unlock_panasonic_air_conditioner_remote_control.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/fujitsu_scansnap_s1500_setup_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fd02fe58cda0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc5960ab0888.pdfIn PDF document text
    • http://blockhcain.host/symmetry_group_theory_and_mathematical_treatment_in_chemistryvoef8.pdfIn PDF document text
    • http://kigurumi.org/kubota_bx2200_parts_diagramy47vi.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/convert_to_word_android_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_5fda21c670e1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_cc98951d80e2416f99e87f18400a3cfe.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_fbd883a38bca43839eb0dcbdcb25d3d4.pdf?index=trueIn PDF document text
    • http://dirazonun.myartsonline.com/nadasowon.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_9e7a9d10cb97485fb7ce8a371cfa9883.pdf?index=trueIn PDF document text
    • http://wasapawokig.rf.gd/cppib_2007_annual_report.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_1730b682777f4a498f3a5a3b515a6ff5.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/ti_84_calculator_app_mac.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/hard_common_sense_questions_with_answers.pdfIn PDF document text
    • http://kepewitibafef.myartsonline.com/gevuzepobitepufutaxamu.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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 5524 bytes
SHA-256: 7d3f51d01f5c80052be2f9ad388031bed0ed031785dc42cde66ea0308b8335f5
font_01_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 11384 bytes
SHA-256: 974c80cc55aebce98700b840540c58c99c754744d1e5a9436a0c0b338c9b9146