Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ee37894ed6fee7…

MALICIOUS

PDF

72.3 KB Created: 2021-02-21 09:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11ec0f9759005b41b81f90a2105aff8c SHA-1: a44b47cb15e064e466ae8a004d8b2613a9bd14de SHA-256: 93ee37894ed6fee77a20c76a424390eda625a08516161f8c475ea7057fffb77a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. Heuristics confirm the presence of malicious redirector links and a link farm structure on disposable hosting. Although no scripts were extracted, the overall structure and URL analysis strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=lean+six+sigma+training+videos In PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/8201118.pdfIn PDF document text
    • http://workmonster.net/wijukufdcxkd.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/53b9d5f445d01.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/metopezenoba-dikap-befejabo.pdfIn PDF document text
    • http://makamar.online/tumblr_aesthetics_pictures1kuqt.pdfIn PDF document text
    • https://xubedemowixur.weebly.com/uploads/1/3/6/0/136004279/2babc7ec9.pdfIn PDF document text
    • http://dilijox.22web.org/master_bass_guitar_tuner_apk.pdfIn PDF document text
    • http://rabota-plus.club/how_many_carbs_are_in_wendys_caesar_dressing0zmr5.pdfIn PDF document text
    • http://rejuxipo.iblogger.org/xesulebuwimomalisi.pdfIn PDF document text
    • http://photoforce.ru/fanelidarenededrts5z.pdfIn PDF document text
    • http://amin-ukraine.net/51758976366gt030.pdfIn PDF document text
    • http://reznitskygallery.com/wordpress_user_management_plugin_bestnd0vc.pdfIn PDF document text
    • http://xruhdfo.site/seserifisapcz5.pdfIn PDF document text
    • http://kinoxca.xyz/30397647419zfy51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sepuxukejobome.epizy.com/katinikomawenodusilamivog.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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 5184 bytes
SHA-256: c76efd9c760d7ad50cc1e75076af76b3950062243c0e3c4aaecf5e07177c8119
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10868 bytes
SHA-256: 72117d75bea82ec427301f9ab2f9159022b39d7644b922e815f718070b868dd7

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