Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b510017f35e12c…

MALICIOUS

PDF

74.9 KB Created: 2020-11-11 21:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9fe0af674cf4890ebf6b00be2dc23a68 SHA-1: bb9a4844d48acf0aa556935f151da2969ede1f1d SHA-256: 76b510017f35e12c522c25691f3a0163a4a52b0147ca7712a9164a9ffd78cf97
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://traffset.ru/strik?utm_term=talktalk+hg635+firmware+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5f9eec01d5767.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/poliwuvidekamu_werakurijegig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fa1e5c3ef098.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/perejorem.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/9164513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f94a8c39d814.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/1caa559b-9652-4e58-9ca0-83da20e7fb32/kijebafipapapubo.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/93960503161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24597830-e9f9-4e3b-849c-e407f20dbc89/66715298603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60260d86-f3d6-42ab-80ec-42d9577a4487/80020278068.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/11743958761.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/allison_1000_transmission_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/92286494501.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/38066681537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17864131-359a-4e60-a38c-997b5a2b169b/wutivonowabi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 5688 bytes
SHA-256: 03a562bdf61f15179f89af7720840c057acc8d3b6511c12e6deb85fa604fbf7f
font_01_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 11232 bytes
SHA-256: 9bf73d7509ce86b031de4aa4ecb27fcb8d13d8d1d982ddc5b69a6fefe1b3642f
font_02_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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