Malicious PDF — malware analysis report

Static analysis result for SHA-256 258c4ea1fd41da7a…

MALICIOUS

PDF

74.5 KB Created: 2021-02-27 19:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a4c634b790f716b2e9d0d1829a284396 SHA-1: 208f102684f3747cadc00774954dbaa654c722ee SHA-256: 258c4ea1fd41da7a6efbbebf0314d8876f1bfc47facd521961f60d9fbe78f36f
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://zajinet.ru/strik?utm_term=nys+driver%2527s+permit+rules PDF link annotation
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/zuxaduxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_600d1c67cb1e4.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/kinebisofav.pdfIn PDF document text
    • https://jepexilopenokaf.weebly.com/uploads/1/3/2/6/132680937/dawegozutajedoruf.pdfIn PDF document text
    • https://vugulufubixe.weebly.com/uploads/1/3/5/9/135979185/nukubejozubumimuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428069/normal_600652320752d.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/tinap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487206/normal_60038e87eecdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fdf9f36e0f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_6026ee4c501f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_6023ca2121d3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60247054a29f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff0bbc7c0cc3.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/kisimujuk/govuvojaxasawejuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/kaspersky_antivirus_2019_free_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/adverse_effects_of_corticosteroids.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/ambedkar_song_anand_shinde.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/bit_torent._com_free_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/68917071167.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5060 bytes
SHA-256: bce3fa3e7bd126a3c4258790ead91ad3cd087e69786245a0360470b8d9e3e17e
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10588 bytes
SHA-256: aae536453608d57239eb61f6e4b7bdfbc288bdaf020dd8ddd77ca88a945a42ed

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