Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbfc495aabdb27c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 22:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c41252d8aa8cab51c9266b742b1b34c0 SHA-1: 87c0e7a60a8cd8b4ae0c40d88cede5c94e2d6191 SHA-256: ddbfc495aabdb27c668265b5458fb6ee77ee78b60ad7dcfac995c2499fa4fc3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of external links indicates a likely attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coevent.ru/upload/files/tawuxogopagudimefevijiza.pdf In PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fakewosemegonirope.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/5682382320.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/bimonefuz.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bulapivugutekawevedirani.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/75888379364.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca1a63e126---wuvedisibawun.pdfIn PDF document text
    • https://togeltop.net/contents/files/domoxogixep.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc959a026---25761844528.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-25/20210925132932439920.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/55961448097.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/sizexobefu.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/nanilibibezevabis.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/vuzuwolobo.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631531348.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/23793481082.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remexabivime.pdfIn PDF document text
    • http://denge.aero/upload/files/morafejovikekupagafe.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/38977599291.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/fegasiriwuvek.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/57879755892.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/72149443397.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/72870431535.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/fabujorakamavunij.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/45321810623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=probability+using+a+spinner+answer+keyPDF 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_off0000b49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 10960 bytes
SHA-256: f21541440e6080d7b2a369c3a0b1fd47169228ca089a5f68eb7ea79bf86351a8
font_02_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 15608 bytes
SHA-256: 6e210c93e001e8694cdee005935134797af2e5bce4de32088e95cbde4d576591