Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55a3fcde5b15fcb…

MALICIOUS

PDF

72.4 KB Created: 2020-11-09 23:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da574721b2381aa82b143a62a1872328 SHA-1: 265e1d50882d1fccce9bb8d6bcdf49194a76c972 SHA-256: f55a3fcde5b15fcb126d440a580fbbc49f445f5e78b0adab454a46f8cf972d1f
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 0.9997

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?keyword=grants+for+high+school+sports+teams PDF link annotation
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/4046726.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/cf8e1839ab1a.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/suxelujaxosi.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/xenibuvabijupefotes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/918d0360-ec4e-4c3f-995a-f8a055811eb5/pinagatodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cd1c38-bc5c-4b01-b1b1-9917bd122d7d/tedadizanazabuzefebumu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/sepokerewesomavoduwegub.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/ansi_sql_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196dd914-3200-4aa2-a5cd-026e5d77f2aa/51032872716.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/libro_aceites_esenciales.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/ward_colorado_fire.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/wutumadokonufalakezetivip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 5248 bytes
SHA-256: cd8073b01c86aeb57131a9ad85e11a24e56d7a8503fa05b340fc68b691f1c39e
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10520 bytes
SHA-256: bfdb36841ecd74fdc2e3b84c64656f948b07e410f06f5382f56a4afbdf81be74
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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