Malicious PDF — malware analysis report

Static analysis result for SHA-256 483da4c3c7da597a…

MALICIOUS

PDF

92.1 KB Created: 2021-10-21 21:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e3d9ee27a6c4442cf99478daf0d24ea0 SHA-1: 3f81356b9a28064adbecd8866e6616ef3acef2a3 SHA-256: 483da4c3c7da597a0524f4ce997e1312697f4e4a4c7f6c712725c826f583f5b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://crysiq.ru/uplcv?utm_term=names+of+parallel+venation+leaves PDF link annotation
    • http://htygroup.com/upload/files/kovexaredoroxino.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/wipokod.pdfIn PDF document text
    • https://chineseclothingonline.com/File/budav.pdfIn PDF document text
    • http://akademibt.com/resimler/files/93164291377.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pobulon.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/natabobaworugogudusir.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/21351197245.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/42307664597.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/13926352174.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/28000098435.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/25065848789.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/615254c4f1002.pdfIn PDF document text
    • https://dm288.com/slicice/file/vutim.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/jatag.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/5673245372.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091021023544200.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/febisatez.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/navedusamure.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/funedajizinewufidumatuto.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/31671501141.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/zudoxijafawelepavunom.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/xijogarididaxaxobujonuni.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/banizaja.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/76388409370.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/38372329963.pdfIn PDF document text
    • http://tahokart.ru/userfiles/file/17233991707.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_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 21908 bytes
SHA-256: 8804fdf8af1a899dc99f0437672430b01adc221590ec26713b1642b80d6f1528
font_01_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A82 10564 bytes
SHA-256: c39d111e9819ab112327f649f6a8d7a68966ff4c8c4cadaa374e2dd634c532a7

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