Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173f2a0ef6f502f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 00:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72d1e3b55efce0c5ed04a92fa3935878 SHA-1: 4ae975dbad7a18e1ff81741f72664282b8b7b3cb SHA-256: 0173f2a0ef6f502f82e96d8616030a4ac3db13fb35b4a6527ec5fb1bb1716bc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://llbyggodesign.se/UserFiles/files/mutisotakikunojirasumeza.pdf In PDF document text
    • https://shevian.com/images/file/wawujuke.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kewosibikiwawipuliji.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/89179640923.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/64712258690.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/69058740763.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/mafimajogubixevovin.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/92897990215.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94627356f---80406063965.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/4773391481.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/bedoguvogalafako.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/kawaduj.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/damitolarineweg.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/5389745543.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/60993420327.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gudasevodefaguvuj.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/maviw.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/bogajuduvaninud.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/42587725054.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/zavegejulizurat.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kukujixiruniwisi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/13628005098.pdfIn PDF document text
    • https://ancoraeducacion.com/images/60475903798.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/zegapogirabosu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/59235854476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+keyboard+new+linePDF 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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 10388 bytes
SHA-256: 71b5cd3221a0ee3c81f2086217f245ca8d2e880b2f031cfea61f61146f8f9431
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 19328 bytes
SHA-256: fa4683536fcd80a9a819586fb16dc46d1ec5f9dc0e518b7ee9f4af2f24f46340