Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a25329856e790…

MALICIOUS

PDF

77.5 KB Created: 2021-02-11 14:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1604317fe0f47135400bf1ce5e2beb60 SHA-1: e8f7636302b8e9127bdc84de548d4180d5308ca9 SHA-256: 155a25329856e7908167ef754ca4a5bfb1f31126906a3e20db6d7817934baf41
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=cute+cat+text+art PDF link annotation
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/3332536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6014a2b492e82.pdfIn PDF document text
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/woxuzetedomesimikopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_602510e7e031d.pdfIn PDF document text
    • http://jazulivorif.iblogger.org/basic_guitar_chords_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazolefozu/8iaQqid/19519321326.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/98jb7bH/borigafuzozuri.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/eBhjhd8/solar_system_planets_in_order_acronym.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/5744991.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/guxusaj-sijulowowuvege-gusigatojow.pdfIn PDF document text
    • http://jobipelulimobo.iblogger.org/graphic_designer_cv_template_doc.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/a7ef705aa7.pdfIn PDF document text
    • http://ulekschool.online/john_cage_dream_piano_sheet_music22qts.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/dd7696f912dee3.pdfIn PDF document text
    • http://hardcreditcheck.info/hdfc_ergo_car_insurance_policyt5h0u.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/ghrUehd/6702757022.pdfIn PDF document text
    • http://klossheff.xyz/as_is_process_mapping0glb5.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/vipawev-vifomosagap-pavibadozuveded-peneret.pdfIn PDF document text
    • http://lidzadva.xyz/mtg_tournament_decks_modernr6480.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://zujofogu.epizy.com/network_master_speed_test_app.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_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 4292 bytes
SHA-256: 1f4f903a6733a35be94dde7d9c5fe47997f10571359989e40bcca48a23907996
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10344 bytes
SHA-256: b5444aea62b88be959f3407d1e62dff7714dc67e9a2085e68b06e846b6c0f8bc
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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