Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1cf11bf8b9b823…

MALICIOUS

PDF

72.2 KB Created: 2021-06-11 16:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 64a0e0437f1da3fdb0adcc15485ee836 SHA-1: e97139df752ad6bba90f16930a4f759094f9312f SHA-256: 5a1cf11bf8b9b823b6718f988626e624f337333c58183d352d76a9e4ff07aa58
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. 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 0.9996

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/silebaluridom.pdf.
  • 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://catamma.ru/pbw?utm_term=the+alchemist+characterization PDF link annotation
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/silebaluridom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_5fdc08834eabd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fcd5f644ffdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60c102c944eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6012dd533cd09.pdfIn PDF document text
    • https://ligizedafovawu.weebly.com/uploads/1/3/2/6/132680967/c06b3af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_602bdc83a518c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_605684386773f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7d1243a4a.pdfIn PDF document text
    • https://dofixojibol.weebly.com/uploads/1/3/0/8/130874360/sikekafezab.pdfIn PDF document text
    • https://wurokilusonopos.weebly.com/uploads/1/3/5/3/135345649/tilodew-fiwuladotolila-tegivinabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4f039a-8e35-42ce-94fd-4f865c1b5918/61278618310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5fbc5c-7338-4163-bb2a-2700273a1987/how_do_you_reset_an_ao_smith_power_vent_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ebff08-964f-49dc-9ee3-d8bb484ad8ae/mitetezom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6c49b2-02f5-43ae-ab11-75c7b2eb4da1/mobile_strike_hack_no_verification_or_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67af8e79-5658-486a-96b2-19ee8b188383/43491380408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655dd91d-4211-43b2-97c9-d683b137fc7a/46765660866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0ec49b-b654-4e6a-9ece-ec5b1cbc8677/nc_drivers_licence_sign_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65e84e4-31bd-45ab-ba57-20c410231373/activities_to_learn_colors_for_toddlers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693e1245-7478-4202-947e-c3a1f273724a/demexubamorolidexatup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903c0fcc-74f7-4cb7-a068-4eb7154b9fca/32431021406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677fda5c-9bfc-4f13-b83f-219f99f6af51/pafadilezizojufowamaf.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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 5040 bytes
SHA-256: ebdcf963a554461a829b3747338f510b1d5a5a4f6dd05fdfc9336a9251117f85
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 10184 bytes
SHA-256: 8d47f3bde6013d2bc329ed2c4b245ca25f0b3e06dedc8262e0893d6aca578944