Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f18fbea86eaa8a…

MALICIOUS

PDF

100.4 KB Created: 2021-01-25 07:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fd80ce4715911229a82095e50137feac SHA-1: 7eba98f0a6762db9bc3235c399663a5e65bfd1be SHA-256: c8f18fbea86eaa8a6db2c37e88bede66756a12f433995f31245f9843fd3ebae5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or SEO spam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious 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 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://leonvi.ru/123?utm_term=titan+guide+ffxiv PDF link annotation
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/cca82d1f419af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5ffa3ca3294c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fdd5bf48b4bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5feba2fc9c0b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ff5ab42594c4.pdfIn PDF document text
    • http://merogerofame.66ghz.com/lipid_guidelines_australia.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/b23f937e9274309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5fce3684b8bc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402267/normal_6002abbc4fd3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380083/normal_5fcc0d51e34aa.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/2977ec8c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5fcb02556ca70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fd2174db6e0d.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/sipalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizaxo/depegogizatezed.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/98425512914.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/whatsapp_gb_2019_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/57699695965.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000158d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x158D2 25064 bytes
SHA-256: e0f92a4ce7de1c0a9479dde8d74e48c2dad4456727e6c28abc6dbe31f8b621d5
font_00_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 4848 bytes
SHA-256: 5716d802702e470d57aa6c208b9cb22386bebb12da8a3040319f29c0b70f39c4
font_01_sfnt_off000131d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 11380 bytes
SHA-256: 24e83cae30033091fcd45d28c172c5e6bb4753198af6532573670ddda23f8b41

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