Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d38ee52f0b5d8f…

MALICIOUS

PDF

117.0 KB Created: 2021-09-20 08:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09928d45ee730e02d7370a2227f3606d SHA-1: 25e9ba8d22a90ae064fd88a3c9caddae95af7876 SHA-256: 99d38ee52f0b5d8f1057c9104bd86831bd98932f427e6573eb69a0e985027acb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nezrenweb.com/calisma2/files/uploads/sapepot.pdf In PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/51828076785.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/66343432900.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/481dd454582eec4af648e475ef9ab995/10465966152.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/nawevurezejubak.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/tewoxutolegisejaz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a313d73503---gamapisizilotuwoluwa.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/88505029691.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/10081863958.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rejarevonosukutuvivisasid.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/1490946369.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/8399095130.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905191825_v8m4y6.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/97236188214.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/jodamadipikawixutogax.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/kebim.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/40126860944.pdfIn PDF document text
    • https://curvy.tw/upload/files/35457976357.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/73426239030.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xewupivetovokefumokelofo.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/37615381933.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/060008508636.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/88536195630.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/tavikituzunovokapo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/57222386381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=motorola+xoom+appsPDF 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_off00016141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16141 10180 bytes
SHA-256: b8d3f7fb266e83368360b52a789e8bf35edbab62172a4aa9ccfb465a06c89785
font_01_sfnt_off00017827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19039 20148 bytes
SHA-256: 77884de94ca0583fee013788dc04dab385119dcc70ed6da8f8b3a659ca21996f

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