Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a403711721a9e1b…

MALICIOUS

PDF

84.6 KB Created: 2020-11-24 03:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e1048f9671fe5ef4f25da69f33b7091 SHA-1: 26f82c539cc1c38dbfa00fdb41a6b51ddb6a1c73 SHA-256: 6a403711721a9e1bab27a29e764fd3b2223cbc15173f66d296f6fbcc367efec1
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=airsoft+ghillie+suit+gameplay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5fafe878815a7.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/jularefopasef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_5fbba91d281c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5fb5bbd3869f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fbbca08cc176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fbc332fb517e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f9e793a2e7b9.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/jipowumat/basic_components_of_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/47747488450.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/k_seal_radiator_sealant_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/applied_biosystems_3500xl_genetic_analyzer_manual.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_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 5408 bytes
SHA-256: d34da6a22ec4e7af9de281029594603cbfeafa8a8517a4b003ab123f4bb29e24
font_01_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 10440 bytes
SHA-256: 890c73d7bc3e09ed0b4ad6c8b55d140ececce2a76a698bf48596f9989fdbfefe

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