Malicious PDF — malware analysis report

Static analysis result for SHA-256 130381dffc20a4dc…

MALICIOUS

PDF

74.0 KB Created: 2020-11-18 01:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: becf5ade5f1841fe2b1eef7bca987d5a SHA-1: da69653262cec8f31c709a3eb2b1c5cdd1b1fb27 SHA-256: 130381dffc20a4dce8ff73d51e256cc3b86e9305307315cba7b9bfbfdb547e77
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/123?utm_term=descargar+spotify+premium+apk+beta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5f9d50e95bfa2.pdfIn PDF document text
    • https://febewizonobuwom.weebly.com/uploads/1/3/4/3/134311996/cf113cf2efb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5fa18f220cf91.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/f976b2f4-20d6-48a9-a74d-0162780aca60/kajubalanejuri.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/21199093384.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/lejudawowamixavowiledeva.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/pubepawosewozurafatixe.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/prayer_request_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/unfinished_furniture_seattle_wa_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a08c3f-7369-487c-a288-1deecb920d86/sifiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679c5487-565f-43d0-8140-9638b94a666b/roatan_islas_de_la_bahia_real_estate.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/pilojeloxujituxexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24fcd5d-936a-41e6-8cb9-e2bea481b062/95252722569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26567c4a-42b9-4c22-ad38-fb0df5b0e22d/nisqually_jail_county.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/worksheet_chemical_bonding_ionic_and_covalent.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 5608 bytes
SHA-256: ecd7ec241790506cc829815f7fe013b970744011a3a08034210f773f5918401c
font_01_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 10916 bytes
SHA-256: b4cce495418c18e4862c24be60b28d6f666c1168512eae7152401cb54c46b1ab
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 16144 bytes
SHA-256: 39b7b4972fd792186d1dc92272b72d3e5f38793e7d5e6f3d93784eb8ce668722

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