Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a97e91d44fbbf7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 09:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a028ae71d208fcf62d749459a52817c3 SHA-1: a915bf7b74d67277e245d8f762def69eb4b1a31e SHA-256: 94a97e91d44fbbf7d2b5a5ffd000b3fbc19b97b9a502fd4c46ef34057b3868b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

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://velapower.com/glwh/UploadFile/file/2021090414253673499.pdf In PDF document text
    • https://reformedgeneration.com/userfiles/file/61279248709.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/41915670857.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/12072030531.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/83430573434.pdfIn PDF document text
    • http://vuason.vn/upload/files/dibezajogubewavosagadidub.pdfIn PDF document text
    • https://digireg.sk/upload/48760499764.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210910205816287366.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xeliligifazamegofukamovis.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zefegosemovajuxaruvuso.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tinuwusegebofalux.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/833065855.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/tisagited.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/6895197766.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/40761742110.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa79ea079---mepusu.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/16189516191.pdfIn PDF document text
    • http://mlead.net/images/e/file/88296511040.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/runuzuxuvezur.pdfIn PDF document text
    • http://novafish.it/userfiles/files/12552653847.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/4725030037.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5efea685---xuvonenobejejafor.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/puguzuxilizipupumuvu.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/pigokuvupa.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/mologaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=watch+the+good+fight+season+2PDF 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 17064 bytes
SHA-256: 25eace9620007123b99539dea7790de08b9b49716b43406256c4a487793529da
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 10724 bytes
SHA-256: 59c69ac8a0668f7d9b6d9c4dc69dafa4513080b1bf7c45db5ac6dee91266fd00
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1