Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ada3557f03dba03…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 15:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4cc8476a2774245896a94f40fcdaf690 SHA-1: ea432b7e7a211b219c5bb4a4810b2edaf4fdbe42 SHA-256: 4ada3557f03dba0399d050888b814e863240288936b6363bb25e1286a29cbccf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate further malicious activity such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://catamma.ru/uplcv?utm_term=sat+books+free+download PDF link annotation
    • http://iknow.pl/files/file/48810849654.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/biraxorebaliz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138357635578---19500912377.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/85631801904.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/97652034032.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/lizepigadewiwor.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kesogonojekokep.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fujazovetamutizukedul.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/deramovobex.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/dofaboxonofewakijifipuj.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/xitogakiro.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/vimofugunidutaxer.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/62574429218.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/raminupofepaxigan.pdfIn PDF document text
    • https://ikansambel.com/contents/files/rujowa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e840bac48---batabazovezalid.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nasosetuxonugipojewixid.pdfIn PDF document text
    • http://esistore.com/userfiles/file/sezazil.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/mokol.pdfIn PDF document text
    • http://trieuduong.com/images/Download/topozewonivajaxotav.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/15667287482.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/99665668972.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/81795597792.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 18960 bytes
SHA-256: a1c70329506734db1cd3366c87d299c51691a514ca61f7c705ba1280aaffd292
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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