Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b6ef3f670bb567…

MALICIOUS

PDF

80.6 KB Created: 2020-11-18 16:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2e9f7cf61c6195bce5d314e1dbd28241 SHA-1: dfc5c8820a2f0963b44d4b13684a22c175766565 SHA-256: 41b6ef3f670bb567bb40c87417c53b47caba58456934ecdea05ec07ec685be7f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=the+new+minority+book+review PDF link annotation
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/2767512.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/mevalotagakiv.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/donuj_piludeg.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/fowikorejodi/d_d_3._5_character_sheet_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fddb3f-eea6-4d77-8628-ff5bdcd24250/zavobufoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7101c1-d009-4181-8f58-2afc8f240870/2015_honda_odyssey_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/25238025636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13123edd-d3bc-4b2d-ab40-af0895cf2465/datoxavobudixukemef.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/molluscum_warts_contagious.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/gigusanuvazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62600eb-536a-4a77-aacb-238e5481b405/buted.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/international_one_design_sailboat_for_sale.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_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 4912 bytes
SHA-256: 35c22922bc597b62ea7753e3d89f9d35f8e59b5f0f245b37fcc4a1ed42360213
font_01_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 11592 bytes
SHA-256: 9a6b189adc32717c6b6d14d7068bed549a1c7bc573a1cb6e2a462e096fea6bef

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