Malicious PDF — malware analysis report

Static analysis result for SHA-256 338baca839afddb5…

MALICIOUS

PDF

80.4 KB Created: 2021-02-14 17:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2367f3f8feac90121de6bd779a4b7804 SHA-1: 700752df1e6baafcbb03e7cd582e0551d1d86f7c SHA-256: 338baca839afddb5d45579f3b06e2cd0a5593133dcbbbee210002514a99f3598
234 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

This PDF document exhibits characteristics of a phishing lure, specifically a 'bill of lading' theme, designed to trick users into clicking embedded links. The heuristics indicate a link farm pointing to external PDFs hosted on disposable domains, a common tactic for distributing malicious payloads or redirecting to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/aws?utm_term=bill+of+lading+short+form+free PDF link annotation
    • https://cdn.sqhk.co/dilizilozok/MhcEhaU/1847724341.pdfIn PDF document text
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/8836505.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/DghUygc/tamusoxaxigaxufore.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/72d98e7b88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fc7aa1058186.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/JifWTqs/spanish_learning_book_download.pdfIn PDF document text
    • http://vukosam.22web.org/jomujarabofizizisilumajik.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/jegomip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5fcf395732b8d.pdfIn PDF document text
    • https://sozikusek.weebly.com/uploads/1/3/4/3/134333331/90fb58.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/igjUgif/stumbled_meaning_in_malayalam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_5fcc996dd8032.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvezijejek.epizy.com/waec_biometric_data_capture_software.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/36151169891.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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 5368 bytes
SHA-256: e229274e4f6c3b5c5d3573702536042bce3d9dfad069d9f4d9d43c9771b38063
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 11720 bytes
SHA-256: 0d259cac1015394ae60cf79a028904648ba70c1a912a9525f23bc6bb3ebf1afe

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