Malicious PDF — malware analysis report

Static analysis result for SHA-256 992530d6086533d9…

MALICIOUS

PDF

77.6 KB Created: 2021-02-18 13:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 74aeddc7343b5f53046b4dba000c2d5a SHA-1: d2f12522968aa8bb642d4bf8e777d1d8f1fe5495 SHA-256: 992530d6086533d952737227585d99c13f1234e2af5de0d48ad9990cfa43fd1d
134 Risk Score

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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=ac+identity+apk+download+free PDF link annotation
    • http://natur-bio.space/zixuxexojakkuvlb.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/aDohicG/lowe_s_near_me_store_hours.pdfIn PDF document text
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/9892427.pdfIn PDF document text
    • http://freshka.fun/furia_de_titas_2_completo_dubladon7t32.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/63b398bb.pdfIn PDF document text
    • http://dom-bita.org/zumokolemogutyntla.pdfIn PDF document text
    • http://jubevejazuten.iblogger.org/shakespeare_sonnet_116_deutsch_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/pugijuzo/iijbieP/boku_no_hero_academia_smash_tap_apk_download.pdfIn PDF document text
    • http://perevod24-card2card.site/vudubunovobigeneno1i2s1.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/ha1eMEq/42326198179.pdfIn PDF document text
    • http://wownatural.fun/tanki_ussr_artillery_shooter_gunner_assault_2yeimd.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/6311533.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/gosete/fowabuzagopadawinomam.pdfIn PDF document text
    • http://supapimegem.rf.gd/icloud_for_pc_windows_xp.pdfIn PDF document text
    • http://dufatiji.rf.gd/69071240038.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/russian_cursive_worksheet.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5220 bytes
SHA-256: 8ca49aa27d0846798ba3649a9fc3dc6cf3f21f0fa853aa82cb7d8316c09e3b66
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10872 bytes
SHA-256: b34ff9b350336b64e4fb55438d66509df523a89b3943bc52f50496c150361ba7