Malicious PDF — malware analysis report

Static analysis result for SHA-256 72467cf2f3d252a6…

MALICIOUS

PDF

82.5 KB Created: 2021-10-09 01:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 5f3c277b3ca6bfe02c29db8ccab0aa6e SHA-1: e4a291db1124c32bac834c2331b925f12d273dab SHA-256: 72467cf2f3d252a62abac0b96c150abc7b40282a617ef8636d6a6dacf2f4265d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://linklandhotels.com/upfile/editor/files/jixiliwase.pdf In PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/53332607866.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/wegawej.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/78081092308.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/xekobetaze.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/kkt0ba9kepto3qjvttlduvlfgg/42197640577.pdfIn PDF document text
    • https://codecs.ro/images/file/3205708049.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/17287987018.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/kotaropupusubomuku.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zinipiwibonexozuloko.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/20906860550.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/tazelewekamajafuja.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/73538181284.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16142333f069c8---16358470992.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/31783963581.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kopijigupabufebavefur.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/71117748585.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/gegorobef.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/72776655330.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/6699504479.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/92600134056.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/tusalo.pdfIn PDF document text
    • http://vning.net/filespath/files/20210905075954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=effortless+english+audio+lessonsPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 20500 bytes
SHA-256: 9ace23010a2a942e47dfe59761aca657a011da48dde7fefd77124c3632d00ef6
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 10716 bytes
SHA-256: 27797615b7a8e8223b9ceb53b853c46c6b24a49164b77c95cd6effdff3c41f64