Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6a1296278bd9f2…

MALICIOUS

PDF

93.0 KB Created: 2020-11-25 07:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 05ddb650217b36195b31afc708ef5e3e SHA-1: 96d315ce10ac7264cd0dcadf3ab0e309e7114e2d SHA-256: cf6a1296278bd9f2cfa5141140be621ef0f965d17413cec5d9ded84dba01cec3
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/123?utm_term=red+rush+360+ebay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f92b1333dc7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f907375d06d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fb9914ca7b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_5fba91fd3329d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5fb2a15bc5fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_5fae01fe7787b.pdfIn PDF document text
    • https://wikoriduban.weebly.com/uploads/1/3/4/3/134341401/nuxorefewomob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5f9c79075da46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f988bee6bca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5f9bd28fb9215.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
    • https://s3.amazonaws.com/lejivugeleguwod/37421800638.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/guwofujumejanelipipos.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/naming_acids_and_bases_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/baixar_curso_de_ingles_em_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/zasalagijaferikisikixav.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/max_bernier_platform.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_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 5128 bytes
SHA-256: e39c429d2c9a20b7165cc60903b22c7fe7700320516240263d0906b9a6fdbc14
font_01_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 11472 bytes
SHA-256: 3678e2ddd2432119c789349555d6fdfda7f381561b43a6db45e729b2e2c4de16
font_02_sfnt_off00015919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15919 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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