Malicious PDF — malware analysis report

Static analysis result for SHA-256 a115457d2ee7dc4b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 18:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e5f235a8b6cf6b647c08a93cad3107c4 SHA-1: cb5d1450b39d490ef7d76a7fd08ccb31cd3a73cb SHA-256: a115457d2ee7dc4b725232a92a1b877ec59da8fdae273eb5d37289fd26fa6940
134 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. It uses an invoice-themed lure. 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 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/123?utm_term=retainer+contract+template PDF link annotation
    • http://tufofol.medianewsonline.com/55395644949.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/22977177127.pdfIn PDF document text
    • http://tuzirawejaw.mypressonline.com/nonviolent_communication_book_review.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/norton_reader.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fdd7b2948fff.pdfIn PDF document text
    • https://kakifimetuwojo.weebly.com/uploads/1/3/4/3/134317364/d9ec02c7ea3.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/pobofu.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/e7e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_603952f537c9d.pdfIn PDF document text
    • http://gavixed.iblogger.org/26136137434.pdfIn PDF document text
    • http://ledukamu.iblogger.org/parupifa.pdfIn PDF document text
    • http://perakaganiw.iblogger.org/70012780815.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/lejivugeleguwod/88975456997.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/52993276672.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/fefirovo.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/hunger_games_book_part_2_summary.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_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 4908 bytes
SHA-256: 18e108b9f0efc3453bf4c65446f06b5313e60d886df12357b38743f6fc9e6613
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 10628 bytes
SHA-256: b2641beb0613405a438b16abad164d8a373e064814d4185c148e8dd23c4081a7

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