Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b923f2e98f76922…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 00:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e763fab7fcb80d298cf740d5a36b266f SHA-1: cc1b42226b7e7dce2442e278aaceabfd8ae86240 SHA-256: 2b923f2e98f76922ebec6d4810e8d38f857de15754d25ed26ed716b2c1c163a2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ttccid.com/userfiles/file/mukogapiz.pdf In PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/kenimixaputijenatigedin.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/pexiwipujataxadomexup.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/xexagoginad.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/tufexivudenoniwe.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/moteravozexuv.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/sarer.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6135500aa1a09.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/32539182100.pdfIn PDF document text
    • http://falerisztika.hu/tmp/47425717513.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/vavukozozepanawutose.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b6eb78e538cbdccb2bbf2720f9d63d78/rakuzofejawezuba.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/vazatesupijitapopi.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/39017146227.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/30162072845.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/78995048660.pdfIn PDF document text
    • https://somogyplusz.hu/files/vegidoroxek.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/22853801652.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/88708207219.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/afaf4726d29c73e46157768659537f52/nilewuvop.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/91453785204.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28669138716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apk+editor+pro+mod+apkPDF 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_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 17516 bytes
SHA-256: d603ebc4f4ab8bd216e72fe083432d674b495823922b14bb338100422a49d487
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10308 bytes
SHA-256: b3466108fdb973ea579b36adaf2dd90df54402039147629c81488f53796707a6
font_02_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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