Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe37c2e21e0a972…

MALICIOUS

PDF

73.5 KB Created: 2021-02-17 08:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20332f31e2f230cc5193f9b57faeb084 SHA-1: f25226edba4927986e225a7400ad0c90dbc9496e SHA-256: bfe37c2e21e0a9726d50d06d0c8334b1109ac77ee6db5f3bce6642d98946720b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect the user to potentially malicious content.

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://jacksth.ru/wb?keyword=free%20crochet%20patterns%20for%20blanket%20yarn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493610/normal_60073499a5ae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fe3a186d8e02.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/945388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6021c2912f525.pdfIn PDF document text
    • http://online-sistem.site/gewimenolagifus41bm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5ff8ef39400d8.pdfIn PDF document text
    • http://ejqy.com/taeyang_eyes_nose_lips_piano_sheet_musicjo2g3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5ffd1e9b41357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_60024ab33307e.pdfIn PDF document text
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/0102cb7c468311.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/acute_pancreatitis_treatment_guidelines.pdfIn PDF document text
    • https://degovemidim.weebly.com/uploads/1/3/4/0/134017519/xoxivi-nibepegetad-wuvobojuduk-zoxakiw.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/6332ef7ff89855c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekolaxoretewov.epizy.com/his_highness_abdulla_film_songs.pdfIn PDF document text
    • http://wuwepapose.epizy.com/comcast_account_number_format.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/formal_goodbye_message_to_coworkers.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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 5364 bytes
SHA-256: fb4a291795f8c2ab23280d32c28e774e4173c511cb85593851fe965f71016f38
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 10796 bytes
SHA-256: 643db2c59d4d351e60c11594038b9110caabd25556f3d43945869c89499df1aa

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