Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4897ed2cd6f5de9…

MALICIOUS

PDF

72.2 KB Created: 2021-02-11 10:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09efd63b2d50e04b3ce77407a6d5a9d4 SHA-1: 2a34833f6304384b6644d4b27f38356f298a75e3 SHA-256: d4897ed2cd6f5de98f7f877bd9da781aad480504d39c5437b4780c9e15be23ca
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, indicative of a link farm, with the primary suspicious URL being https://leonvi.ru/123. The heuristic PDF_SEO_LINK_FARM firing suggests the document is designed to generate traffic or distribute further content through these links. While no scripts were explicitly extracted, the presence of numerous external links and the 'Phishing.Trojan' ClamAV detection point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=corinth+classical+academy+lower+campus PDF link annotation
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/rolowuwudopevud_tarafopuxefob.pdfIn PDF document text
    • http://wegutamozeji.iblogger.org/69524894486.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/6568960.pdfIn PDF document text
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/2800949.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/1955712.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/gatujometopuvin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450247/normal_5fe03f8f44fc5.pdfIn PDF document text
    • http://icily.xyz/bombay_dyeing_diwan_bed_sheetsv5f6h.pdfIn PDF document text
    • http://lnstagramoriginal.com/zombie_hunter_d-_day_mod_apkb8ylp.pdfIn PDF document text
    • http://datujizid.iblogger.org/96588546461.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/likerajatob/wewubafa.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/95070577360.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/xutitaleful.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/immortality_bee_gees_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/4417113018.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/pupozed.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/55013247187.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/bowers_beach_de_fishing_report.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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 5412 bytes
SHA-256: 4a6517f8f7f953ebe77edbad00fea493183635248739296b55e46a4ed667172a
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10868 bytes
SHA-256: f57cd5296ca893db99db3532f0a23d46b380a8abd4d13ea026286cdd1815d85d

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