Malicious PDF — malware analysis report

Static analysis result for SHA-256 529d37632fdd3044…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 04:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84bfbb40b9b0a90f412d1ed363c005d7 SHA-1: b15a342f774e45866150d77c58503951c09b3cf0 SHA-256: 529d37632fdd3044045e23d0379409c8b1f25c4c641d3ce43dcc4cfb5446603f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or scam attempt. The primary URL, https://jacksth.ru/strik?utm_term=norton+shakespeare+3rd+edition+pdf, suggests a lure related to a specific book title. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jacksth.ru/strik?utm_term=norton+shakespeare+3rd+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5ff7578716715.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/bTheigE/gameboy_color_backlight.pdfIn PDF document text
    • http://deflecfcvy.best/82771656673b3q9x.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/jbhfifz/slaughter_2_prison_assault_game_download.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/b9b57e51ec.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/jeguvonovise.pdfIn PDF document text
    • https://lerozezowigex.weebly.com/uploads/1/3/0/7/130776164/nuwawarepobu.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/gYQv8jj/windows_10_ltsb_camera_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/a4bjafa/4_row_air_planter_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/h16Rhay/premier_league_fantasy_football_gameweek_6.pdfIn PDF document text
    • https://kiwepuzimogavuf.weebly.com/uploads/1/3/0/7/130776877/5240719.pdfIn PDF document text
    • https://cdn.sqhk.co/delotijuw/Fhigfja/frozen_themed_ice_cream_cake_near_me.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/4648765.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/hjghFih/download_stained_act_1_apk.pdfIn PDF document text
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/zigosivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 5292 bytes
SHA-256: 981c27d39669a9b459d4abfc2b320e2e5f3a5fccde7ea33eeac453efcb1416a5
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 11048 bytes
SHA-256: 6f9b1fd041ac6774469e25bcf1be7a2638cbe1b22145f65339e0db73e629bf02

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