Malicious PDF — malware analysis report

Static analysis result for SHA-256 7833a95a805c9bfc…

MALICIOUS

PDF

80.4 KB Created: 2021-01-16 11:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02b708adea9d48ac2e3163b9ac0f90b7 SHA-1: c5f84304f6e7c8bfb30069c99dbb4f7e5e3bd5af SHA-256: 7833a95a805c9bfca78a9811fe996cb2f408f37a4cc4f62b14e590d7bc461833
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 0.9995

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://trafffe.ru/123?utm_term=grand+summoners+luck PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f946d0b27818.pdfIn PDF document text
    • https://site-1168052.mozfiles.com/files/1168052/90705972020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5ff4af2c3b34b.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/2851821.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/hiUgFxu/zudafivinasagatugomefeda.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/bidivo/47034079485.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/nawikowi.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/kewamuwusaputivowa.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/rileririsogepelena.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/manuale_cinema_4d_r20.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/mister_babadook_book.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/73543222952.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/becosules_performance_1mg.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 5180 bytes
SHA-256: 37896b8d62c7efef25983f79102e9ed443f3e31394e20d584f80c2bad906e1fe
font_02_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 3048 bytes
SHA-256: 5a0aeaefac230afbbc8afa12e444d103d5aa4af2eb5420f6164167c2d5d972bf
font_03_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 12632 bytes
SHA-256: 26e8553516204d7cf9cf472c4d89334a684d23aa4ce45e96cf3f113d02effa79
font_04_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16444 bytes
SHA-256: 043f6f6a32bf87755cecd9e124a97e44c195ecceb8f91d1838c4ee5d0c7fe59b

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