Malicious PDF — malware analysis report

Static analysis result for SHA-256 581796321c39ed45…

MALICIOUS

PDF

76.8 KB Created: 2020-11-20 04:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 139c42a05fb94bfba01eded510677c94 SHA-1: da01f8c52af0f848cd8d4d76550114f5e3ed139d SHA-256: 581796321c39ed4504908c8bec41acd6bf09830f0341f60edc8f7a2e7f3d1f0e
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://traffking.ru/123?utm_term=south+bend+lathe+for+sale+south+africa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8740d9ed998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443362/normal_5fa593d109eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_5f9e438585908.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/3408347.pdfIn PDF document text
    • https://karojigulad.weebly.com/uploads/1/3/4/6/134623473/ravojivopigodareto.pdfIn PDF document text
    • https://nukoxifade.weebly.com/uploads/1/3/4/3/134332817/putebele.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/zuwimadaneb/battlefield_4_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/craigslist_phoenix_arizona_gigs.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/10973745133.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/texexab.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/xonemevo.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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 5352 bytes
SHA-256: 14ec1366dac623409f14b7a9ba1cc731279ecc828b49bcf6621ae482680d51a8
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10680 bytes
SHA-256: 60fc82e5e3f9241217d770fa0903677a04157c4b61fce98a97d77729fa52a512

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