Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8157eed0efe1c25…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 16:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d002127d86620ae1a69991d052ba2df3 SHA-1: 9adc7da65eef828537825df7ff6406a7eea05411 SHA-256: e8157eed0efe1c25c1da331fa0bceb944d53b1422e21d24e23788dc79682d8f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score. The ClamAV detection further confirms its malicious nature. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://akicgiyim.com/userfiles/file/671361195.pdf In PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/97970376254.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/norezewabuge.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wexogekisob.pdfIn PDF document text
    • http://e-sportis.com/images/upload/11494925244.pdfIn PDF document text
    • http://julianina.dk/upload/file/71593904044.pdfIn PDF document text
    • https://securitydm.net/slicice/file/xuxajuxifalufoda.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/ponevadubijixunubeg.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/98284748138.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16134c16041aed---81350580301.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/44318217699.pdfIn PDF document text
    • http://ed-union05.ru/files/file/dedixogopiwogovi.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/33826513825.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lopelogakoba.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/noxivufedi.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/4439958990.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f5a4d265d5c600de1351ed4aa113565b/gabegizepijuledeka.pdfIn PDF document text
    • http://autodilygood.cz/files/file/50346053231.pdfIn PDF document text
    • http://intertravel.hu/_user/file/37304982707.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/6120764947.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/92911466672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sniper+3d+mod+apk+coins+and+diamondsPDF 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_off0000ad58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 16484 bytes
SHA-256: 7b5bccc9583000d61741c0f7ae93e733f7473de9dbcda1cb9949b02b442bc34d
font_02_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 10872 bytes
SHA-256: bc378a8c0e2bf15f72b63e4f9874be1e5d0afa20af403062fce6cada1cec051c

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