Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d14cee1f3db91b1…

MALICIOUS

PDF

103.5 KB Created: 2021-09-15 23:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a161418548e5e60272d86b73c705d633 SHA-1: 2a31d3284020665ba802da0dfd44975191eb6142 SHA-256: 3d14cee1f3db91b1a7bf4c949f977952213a9bc0f57b6cbe227e3be07a124642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://synerhu.ru/uplcv?utm_term=linear+algebra+with+applications+5th+edition+solutions+manual+pdf PDF link annotation
    • http://lukasikgroup.pl/Image/files/25327978384.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/18730850125.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/novivodutatezeginog.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/jasamu.pdfIn PDF document text
    • http://centrons.com/uploaded/file/70421653261393d861afec.pdfIn PDF document text
    • https://hoavily.com/uploads/files/61512047669.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/44265254743.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/negasajimev.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/15478754443.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/vavepifajesuk.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14305344530.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/68791485818.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/najilakikudiwe.pdfIn PDF document text
    • https://adikmanis.com/contents/files/pusawamajevizesewi.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/sexosusisun.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/ximagejizevonixuguz.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/fukezibikex.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/muvivaxoxuw.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/413844568613db961e7bf2.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904091256581642.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62812200152.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ade314729---kudikivuz.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/zowexuketatajedokalab.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jafodaduvupiteguwokujurem.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/59b7891d2efba8bacc62a16cd5920f5b/88888645816.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/36662043274.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_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 11484 bytes
SHA-256: bdf54d5db9dcdecdf30819b625f4aa7648287543dd495212924fc532a9935392
font_01_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B75 20152 bytes
SHA-256: 53600102f37885973e1409d27cf4acc2abade2fd342a7ad09f3fa6d42a71c81d