Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0421898b4869c6…

MALICIOUS

PDF

78.6 KB Created: 2020-11-20 08:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dafe140d79c26283f048da8033270897 SHA-1: d5265f256c91f94dcbcd8b135839180eee10ad23 SHA-256: 1a0421898b4869c6da7c5f8edfa17dde4290a54215f85d03eccdc68892608b8c
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://trafffi.ru/123?utm_term=best+online+apk+downloader PDF link annotation
    • https://kipamafulu.weebly.com/uploads/1/3/4/5/134588126/kimija-dasamebazano-junus.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/levijuxomemal.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://s3.amazonaws.com/tetofamuxulil/movie_streaming_links_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/xavosuzopajivedudal.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/72623197547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f92c7bc-7981-472e-945e-36ace7690c62/verbos_en_ingles_pasado_presente_y_futuro.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/80714292084.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/fofanulib.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/anthony_giddens_sociology.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/red_paint_people_of_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8c988c-4c09-477d-b8ab-10f5fdc8f025/lakaviguza.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/mukipugaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/penderlea_elementary_school_willard.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/49209804768.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 4948 bytes
SHA-256: 43457ebd96566e5950eee9e8f3caf98bfb434b02131c7401a92441448e816bd8
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 10820 bytes
SHA-256: 29e71035e66e777b0475f64a24ce2d8bbca3d42ea1432cd6ef79fc3a2e634419
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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