Malicious PDF — malware analysis report

Static analysis result for SHA-256 581ca363406a0a5a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 04:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 376e505f1a2ebb0588250b9cc8179069 SHA-1: dd33ece233c191e2902f01ecff4cfadfa0da7bc3 SHA-256: 581ca363406a0a5a16c0aab63698bad1cfd88ef36868e8dbce2785bc7d858fff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly imply a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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://bjerkelunden.org/content/files/userfiles/file///saposavaselewob.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355836ac864---77327497488.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/76547157663.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/vivofulowolelu.pdfIn PDF document text
    • https://mattress-leader.com/media/55430875513.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/64768025161372b84e88f3.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/34780132705.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210909065453.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dea494ebf0ed338f397194d6f682692/kapinipozebuxomob.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/85558681828.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/59491823023.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sizufejoxovagibidu.pdfIn PDF document text
    • http://risme.vn/files/37516556415.pdfIn PDF document text
    • https://chv.vn/userfiles/file/48201884321.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/82425791104.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/fatefobubupo.pdfIn PDF document text
    • https://expomediainc.com/upload/file/75355473665.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109040611106421.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/lejixadaxesunelasikewule.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/xerowidekene.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/5999647066.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/89869107149.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210902_F745A97218366461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=benefits+of+technology+in+our+lifePDF link annotation
    • 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 10720 bytes
SHA-256: fc5fd497b5e7999e1692b54aaf91a8e2e768bc36c4e3887063186fcdc602b4ef
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 17196 bytes
SHA-256: b4d32c86f7183b3e982a969f5203eae7645b962221b32bed5d5de782fef591ff
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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