Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1b1225580d92a5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 20:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 100de065558be66a1fce70927b3afac6 SHA-1: 77f0e2db1d048d98f80203325c8930e49e5ffc1d SHA-256: ab1b1225580d92a549e157f03b7a8f2213751b4fb92d3699a19f960e8f3fb3ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a download lure for Windows 10 ISO. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a pattern of using disposable hosting for multiple links, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=download+windows+10+iso+image+file+64+bit PDF link annotation
    • https://deycaterers.com/ckfinder/userfiles/files/64407837148.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15893776139.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/galixigawunesoxudap.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/tirivotivivunejodulog.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zinonedonubobubomevupom.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/35135672498.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/58064268185.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/65363585082.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/96817393162.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///60143458631.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132674eafd5e---firilokelorumedu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83611289353.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/61585429477.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28016770022.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vexaw.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135835222be3---14104173092.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/46815274669.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/rabeze.pdfIn PDF document text
    • http://chamdure.com/DATA/files/90255164304.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jikidanu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/9561322296.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/17136397182.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210905042552.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/kazapolesavo.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_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 17920 bytes
SHA-256: d803c6e7c0c1af444abbd35a3541d61260dcb1d5fae7a1297d264dfdefca40f7
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 11244 bytes
SHA-256: 08f73a2304e64f96e505f525e6660de570309a3a051f646c0e0cd01fa608d337
font_02_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1