Malicious PDF — malware analysis report

Static analysis result for SHA-256 825aaca3c96d343f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 09:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ba3ffc4d0c4adbea5a8996885763780 SHA-1: 9df32cef4ccce74020240f2f443fdd5b6428ae62 SHA-256: 825aaca3c96d343f4430fa99148e603d344b67236139e8246efe16c6d5da8099
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a redirector with a UTM term, suggesting a phishing or spam campaign. The PDF structure and numerous external links indicate it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=installing+ios+on+android PDF link annotation
    • http://taemyung.com/data/upload/file/26671800848.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/xebiwazibirofugamijorog.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/mokexizixuforedenexotij.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8dc50d6de3f09ba9dea96a27acbd3069/wuraronivewosuzufedok.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/30163981728.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/vegexawufiwevatowolog.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/kejel.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/miwukidekepufudabujujujav.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/xivugimepobosisamami.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/21183749206.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-8/20210908142136498831.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/64310734163.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/44114564670.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/nodizapujazimemimad.pdfIn PDF document text
    • http://alkanboya.com/files/file///93769013810.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jiwesafifak.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/63356085809.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613fdf143f2fe.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/32904889365.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210910194851.pdfIn PDF document text
    • http://nenorm.com/files/files/53653595196.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/73268908040.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 10240 bytes
SHA-256: 23a11864adcdf2afac9fefe0c52e4952c6caba4df9baac8cb3f07f0d19d6e0c7
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 19356 bytes
SHA-256: 082bcaa62323436a6934b5eb6c6697039a4a16634d67db6d85508348eb69a50c

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