Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e2c3d650c309ee…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 14:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a52c030f1b18eed7a77307f731bc512 SHA-1: 0501719de231c1f11d8946be558a405deaa94fc4 SHA-256: 09e2c3d650c309eedd9288d9a431ecb08fc51fe866a1146a2cf528faac6f84d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://hcbarrett.com/user_area/file/24643592490.pdf
    • https://rocksoliddesigns.biz/userfiles/file/pigiretajipefesuvelun.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/17c0a4e9bec4434eb01f68ef76567985/95156727675.pdf
    • http://sattosushi.com/uploads/files/50442579129.pdf
    • https://mavibusiness.it/file/62744484453.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/denavapaludegugipuweladu.pdf
    • https://b2cexpressdemo.com/userfiles/file/86007537160.pdf
    • http://refpecsbelvaros.hu/kepek/files/fuzojage.pdf
    • http://astorandblack.net/emailer/userfiles/file/84633921510.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/kunuwenobapo.pdf
    • http://montesantangelo.it/files/files/60740909450.pdf
    • http://clingac.com/d/files/wagenawur.pdf
    • http://tuzvedo.hu/elemek/file/97198799313.pdf
    • http://mariamozharova.ru/uploads/files/lawaberik.pdf
    • http://angelascanu.it/uploads/file/63391102746.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lasoretuzonuzomodem.pdf
    • http://tecsun-moscow.ru/docs/file/suxavezus.pdf
    • http://pttaccounting.com/userfiles/files/28608374043.pdf
    • http://biosurfest.com/userfiles/files/sadunefojegilinodoga.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ahb07kdr77shovidlipqti7fh9/zefikibanotigisi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+shutter+island+online+free+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc1.bin
3aead3ce652e96fb9ca78e8376f0cc1c19849baafedbb4f1ff872c7c3ac5a4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 16684 bytes
font_01_sfnt_off0000e60a.bin
4511e7fa99ffab70ffdf9f2fe9406976ea3bc1d94f06ace4d8c1490552b8c69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10900 bytes
font_02_sfnt_off0000ff1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16792 bytes

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