Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148334a483000f1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 02:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83c9b2e965df53b6b3306f282b2971c8 SHA-1: ea9fd542d0bea269d49fbe1a4984dcd4f8ebe66b SHA-256: 9148334a483000f115480dd2ef4328f9e619aa33ea0af9a763667c3d8ddf673d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or spamming operation. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://huntic.ru/uplcv?utm_term=the+legend+of+tarzan+full+movie+123movies PDF link annotation
    • http://residenceraffaellotorino.com/userfiles/files/midalaxakazivowukilo.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/57788081759.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/gedolojugugejugo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/79029965872.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/42095432849.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pofamokanukuje.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/nokafawaxiwenatanis.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/87758298075.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/89606004219.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/fobot.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/52768482361.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tuziguwuli.pdfIn PDF document text
    • http://bienbao.org/uploads/files/65644734223.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/77054051592.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/kamanunubojevasaguj.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ropamoverimowoxosasupul.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l1qks653s00eddp7e1muok5r73/17822006353.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/zevekewurorewudetituta.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/ximidazajej.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/neludegexuvug.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/73674513577.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1631245999.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9i8ps33em84im0f609ndmnqo96/65972102650.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zewasibazunuji.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/72700590940.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/pijerunofopopal.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/260805642.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_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 11332 bytes
SHA-256: 64fe6c640ef208f8228ffc9ed05f453c16c9349187bae58dd18471a6c2735f85
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16248 bytes
SHA-256: 80fa03a5f9eeeb9efc450551724d1a24a3de43bdd4b6f5a7fec87130ec2b5c5e