Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02b257bf1b31199…

MALICIOUS

PDF

92.0 KB Created: 2021-09-19 08:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdaf9cc836f112ede724cb3cabef0ab3 SHA-1: b6aa90ca22ca91b64a29bf2b9271b766d6a66d06 SHA-256: b02b257bf1b31199ace4f1a1d1dacd1aeae7a034ff79f2e6be9b03bce6ba85a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0fdec56e---61986606576.pdf In PDF document text
    • http://achwvs.love-mrt.com/upload/files/20382665254.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/67738732043.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/39474831640.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144b33f90b33---fuvuvisalo.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sabaxerawofogotalibe.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/zopamifumujojajenivet.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/woxowejabujale.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/96241161893.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109050518046179.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/timisusezi.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/29217846011.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/resutoweneraxomojape.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/jeborigud.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/54810499287.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/20719239252.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac742862b0---92825080300.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/gikusenuxotafolenakasa.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/20112174714.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/79087624981.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lotokafi.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/fokazubolikego.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/2883816547.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wijuxiwizalimikobabo.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/mekoperi.pdfIn PDF document text
    • http://chinalabware.es/d/files/34072606313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=after+full+free+moviePDF 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_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 10088 bytes
SHA-256: a9e40cb9b5e2146e0903cb96055d2e15a5600e9d8fae15d9b274f61fd074afd5
font_01_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 17228 bytes
SHA-256: 87a02ddcd0ffbe2666455840ec862fad419699cb52ad282e7b8660527199e11c
font_02_sfnt_off000149c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1