Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a91e5145fa4d88…

MALICIOUS

PDF

59.6 KB Created: 2020-12-21 22:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2f42a56072babbd162e56d82301491e0 SHA-1: 902484505c551119a6f3cc2bc515825d3ea0c14a SHA-256: 73a91e5145fa4d889160c720316db505b636285399d43f88dfb2ef8b34ff24f6
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=snake+simulator+anaconda+attack+game+3d In PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/6307089.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/1469271.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/donanefiwo.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/4697506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5f9d15636ef5c.pdfIn PDF document text
    • https://jesuzexujugom.weebly.com/uploads/1/3/0/7/130776612/dowipileguzeremavuxi.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/b2e353ac-5443-4ab5-aa32-583a3285ef1d/feed_anderson.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/smash_ultimate_dojo_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/roxur.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/expense_tracking_spreadsheet_for_tax_purposes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50419a3bf4b14abc377c2/t/5fd2234d8185f4776a164c2a/1607607118413/vuxazeni.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/baxalolekalunevazaromoti.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_off0000ac56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC56 5592 bytes
SHA-256: 2328ee83c0b9a8c51c5bd50604d1fa5ea167de683fc70d258da9b9a2d61252cc
font_01_sfnt_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10420 bytes
SHA-256: f25cc4cc7df4069df0dc4d6121e47cd924ccb86ecc6bca7da4fb10f56837a57e

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