Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4a3f0517ff9a5…

MALICIOUS

PDF

80.9 KB Created: 2020-11-09 19:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bd9aa0145e9c6c4202ffe76eceaca1a6 SHA-1: 97bf7e164fc7490cf955498efca9caa54df3b361 SHA-256: 0ca4a3f0517ff9a5ef7418862edfd20014a33173413cfc337872b57d34cf249e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9998

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 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.
  • 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://trafffi.ru/aws?keyword=watch+avengers+endgame+online+123movies PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/89768626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_5f9fbad5dbd23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5f9acb8bd260f.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/voxeduzuruvimo_nofavavazuf_nuvidivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_5fa3a8e3a1d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5f8e404172d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f904d40e1450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_5f9983e5cf29b.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/788e3982-bc5c-4630-9f53-4f48dec0fa94/kodojuborevalivunibobafex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d1b15d-d502-4c95-aa17-7dc0f6f5c3a6/the_federal_in_federalism_icivics_strengths_and_weaknesses_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a93838-b8b6-459f-8a66-65da0fac7fdd/sex_linked_traits_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0d6d9d-1ccf-47c3-988d-6c4fe6c31cc0/28328127691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808be519-f09c-44b4-a6c1-bb2421e8c44a/dexebozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b01383-2781-4bee-acb2-c9187c416810/bosalakatumozazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e6d68c-c953-4d97-aeb7-15e129d76e00/49813831034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a4a9c1-539a-45af-b9ff-a754fd693c73/professional_transportation_inc_driver_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b692cd24-5697-4cc9-bfca-4f2606a55b07/legixoraresil.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_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 5772 bytes
SHA-256: dcf54f0408d3b613983d5644eaedd374b7f0601929afad78554b88e864e00a99
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 11328 bytes
SHA-256: 13fe0e8a2b6c63cd4c70f902e8d517aaf52d496a4034d3e40f8e0335881a624b

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