Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee9cef700e5938…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bdeee5a4e2d901d8705c334c02a48e51 SHA-1: 9539082c145e972c7e5e190c126a21784af12b63 SHA-256: c3ee9cef700e59382a934f46fba7ddadabc772402192a8198c2ea113751eceee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which point to PDF files on unknown domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a likely attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://tavcam.com/upload/ckfinder/files/dozunaxomukutezawimojiz.pdf In PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/90178067455.pdfIn PDF document text
    • https://riwg.in/userfiles/file/fafijukaliledipurenu.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/nuvade.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zosanivesopuguviji.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/2795737635.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/desuwiginerevaze.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613302b01d7f4---tedujomuvasuvojof.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/41376156743.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/97392423518.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/kinaporoxefajakikaxipij.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/25912320801.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/58205008152.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xadaf.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/10733075917.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/95239281581.pdfIn PDF document text
    • http://mackits.eu/image/butamatedaravumaninajito.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zulusumor.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/48489736086.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/55394544413.pdfIn PDF document text
    • https://eguiders.com/uploads/71923576666.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kogoguzuborapipefubujago.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/847610250.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/xefagenogosurewos.pdfIn PDF document text
    • https://anpheatingandac.net/nbloom/fckuploads/file/davegemozolijijisadapet.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lavajetexesupapero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nsfw+android+games+freePDF 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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 15264 bytes
SHA-256: cacd7097306b7072eb6d328330f93edf1a54829e020839e204a1af64ccfda781
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10616 bytes
SHA-256: 93a32ecaec86565ca6fd86c1f24613c778210f3aa1b0e01222f5da915df86300