Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5478cac0fc6e54c…

MALICIOUS

PDF

84.5 KB Created: 2021-04-28 06:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 36567c1a3b1691886de518bdebc4cf28 SHA-1: cf149c8b20a4b1950c8eb30554fc929c4a791b92 SHA-256: e5478cac0fc6e54c6324be7e2f8f63ccb149a55411c9e63ee698e305b766c968
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to 'maypoin.ru/strik'. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a malicious payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://maypoin.ru/strik?utm_term=quimica+organica+nomenclatura PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492900/normal_6056f61948148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_601bb05b182e3.pdfIn PDF document text
    • http://sodahq.club/fesazixaje8sbry.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/jozisanirefipurolis.pdfIn PDF document text
    • http://4338bacchus.com/cisco_vpn_anyconnect_androidjtq1i.pdfIn PDF document text
    • http://mishabelle.ru/67502464235esnrw.pdfIn PDF document text
    • http://xrootunited.com/888209225787l2ix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6040b03290b3e.pdfIn PDF document text
    • http://medgaj.com/74206922012i1rgw.pdfIn PDF document text
    • http://moitender.org/chowan_river_fishing_report_201876rr7.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/41781150769.pdfIn PDF document text
    • http://mini-cam-v2.club/481148291583nez9.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/can_i_use_thinkorswim_in_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_5fea42a989df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_6051e06ed5c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5fd793e74a059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_606b4bceeb240.pdfIn PDF document text
    • http://setofexperience.site/safety_engineer_salary_in_south_africa4k0hq.pdfIn PDF document text
    • http://cancandance.org/30752220158yggmy.pdfIn PDF document text
    • http://keysecret.ru/after_action_review_form_freesfv4r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/stormcast_eternals_battletome.pdfIn PDF document text
    • http://susabumo.atwebpages.com/bodmas_tough_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede3d06d-8a42-41fb-ade9-60715be5e005/vagaseze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728c5235-c135-410e-aec1-7fdd7b7af53a/padi_junior_open_water_diver_certification_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b819b25a-ce4b-442d-b287-d6a16e37dd8f/30880017053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb11b36-6b6a-4fee-b11a-508c62a9405f/dakagusojifake.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_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 5004 bytes
SHA-256: 6dd851f9ca93951baa08dd8f8daf6c5bd00226768beffa6fa41a120710899d0e
font_01_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 12360 bytes
SHA-256: e7b0c2ba8bd3ef03ad06237d61fcf44cce35974adfb204531ed9b60af3fe7835