Malicious PDF — malware analysis report

Static analysis result for SHA-256 b990f259eabc8c46…

MALICIOUS

PDF

85.0 KB Created: 2021-03-24 05:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eb3eaecd66e4f44f2d7dbe84a69024ec SHA-1: 1a4e2b589c908dcceced4cbefb7bb70a7caa3268 SHA-256: b990f259eabc8c462e6e694e3bb1d541b2811795501bbd511fa526146417250e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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.
  • 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://ponafet.ru/award?keyword=javascript+tutorial+pdf+in+bengali PDF link annotation
    • http://jekenufakewe.mypressonline.com/what_is_to_be_done_lenin_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/ijhbXje/ualberta_library_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/bhEheHR/demalibufoxixa.pdfIn PDF document text
    • http://sy0n.icu/64856492593yv12f.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/what_does_suspicious_package.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/adv_14_2020_hssc_download.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/tegugozakega.pdfIn PDF document text
    • http://iclod.tech/kasaganarbfc4.pdfIn PDF document text
    • http://komarovskii.xyz/dizegifokoselamuvorubefrlnkz.pdfIn PDF document text
    • http://hesap-al-sat.com/24326406588emgdn.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/58623995433.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/45818677689.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/gU8ibXG/lupurodademefofuda.pdfIn PDF document text
    • http://nikupajosokob.22web.org/fuvaximonixipibet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natunizogixot.epizy.com/gijamerasolalotujedezefu.pdfIn PDF document text
    • http://fabonejane.onlinewebshop.net/best_bread_machine_recipes.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/briggs_and_stratton_small_engine_replacement_parts.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/worimetaneref.pdfIn PDF document text
    • http://pegewolonu.rf.gd/codename_villanelle_book.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5512 bytes
SHA-256: 226b13fe9fa671621bee80b5e370eba95a6b39dc84e28243706371ea7288b674
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 2332 bytes
SHA-256: 2803e4ab06345ba466320c57d9286f62181b5816a6bcbbfb76de200d44345203
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 10448 bytes
SHA-256: 5d6261f93f0d92e0d3b7ee7797a8ae7f62e56a6b28ebb823c8a1d49c29588941
font_03_sfnt_off00012fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE0 16328 bytes
SHA-256: 68fb388c6b89fa332810f41b5bb86928254c5d182ee1207b277fc27fe5f5d1eb

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