Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cb98495adf5dd7…

MALICIOUS

PDF

66.7 KB Created: 2020-11-11 12:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bbe8452c5dcc43fdd7c1a23bffaac081 SHA-1: d67d547c589a6bdd4275cebde8e4f74a8d01f124 SHA-256: 37cb98495adf5dd741286d2abbebaef6c1d09859427aa3da834e46b8e63f31c7
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/strik?keyword=supreme+court+case+studies+answer+key PDF link annotation
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/2957272c80e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f8de0196474f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f8a7c06b3f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5f9e7ff4b558e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_5fa888f4d7915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f97de32069c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f9e90b03f699.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/monaz-tivawasabowita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fa5e3261439b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f97cb3ec33e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fa1eb951458c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5f950755c4ddb.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/jebokizez/mekoloxulesavalu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/vodimosos.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/town_of_new_fairfield_ct_ordinances.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/91167776334.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_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 5548 bytes
SHA-256: f41f73b47e75349e973386c02c442bed0abd369aaea162eedf3622b86164e5c9
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 10156 bytes
SHA-256: f191dfe447f67ddc83077ddfdc23bcfca2ec9679f7b1eb1cb3f7853b525eecf7

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