Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fd32cafa34d412…

MALICIOUS

PDF

72.4 KB Created: 2021-01-06 22:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2ac86fff5c09e456d1d24a1d0cabae2b SHA-1: 90ecd70c02b135f967fa59aaec786f2f97db18ba SHA-256: 74fd32cafa34d4126a65263720d1986367def4639c9dabcde73f9d7cc9b37f12
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF with a high ML classification score and ClamAV detection, indicating malicious intent. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple external URLs suggest it's part of a link farm or phishing campaign. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick users into clicking malicious links, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?utm_term=integers+word+problems+grade+6+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fb92c062f8f4.pdfIn PDF document text
    • https://mumoporexebaxuz.weebly.com/uploads/1/3/4/3/134339912/madiberuteb_zenaxas_lodolom_fikupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5f9a2c8a47565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5fe467f02d033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fb4eaf5e5b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fa8db95b9b7c.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/4622ef8d-c989-4d09-a31b-84d98b68ec2a/dejivenakedip.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/reddit_any_given_sunday_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/paypal_payment_receipt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f564f32-13a0-45be-8d9d-596d4a9c5fe9/32124780711.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/job_costing_template_for_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/nivimajiwiwevexoz.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 5484 bytes
SHA-256: c7d73bbd3e2bee1c931ab349ab131a81d96512398cb75d0d6ac38f1b54825724
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 10680 bytes
SHA-256: 37fe57fbe206f8a827b346954015356bc9816c5071ebed2b7f79119e30facf61
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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