Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ff3745991a4575…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 01:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5867672b544408a957e26c44e745650d SHA-1: d4b88a14fc8b05c0af807e44aef5b6e1e69149a6 SHA-256: f2ff3745991a45757ef000a76b44cfb6a8e5e9c8fab61453e1fecf56e5d1d806
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://synerhu.ru/uplcv?utm_term=fun+run+3d+mod+apk PDF link annotation
    • http://domki-kopalino.pl/pliki/49612286382.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/rezanogekufufonoxa.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/25148141788.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/betaxivibamoxunirus.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/68515714447.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/31499124269.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fumalupik.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/firiw.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/deruvozowododufulupedo.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/97925115354.pdfIn PDF document text
    • http://boldogelet.hu/media/53591337723.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/duxunupavosutijagi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ec60b3031e18e53f92293cfb39d4273/fanojitigivuziju.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/45979147065.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/81368111067.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391afa7b201---52177775130.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109051234528936.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/50135864984.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/25306229323.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/jogogokufatu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/5343733987.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/segoluvakobitizas.pdfIn PDF document text
    • 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_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 10356 bytes
SHA-256: 3a77e228f017a2434abcbaf9eec5cf62a6402d5f14b9471062f33b66452d0cf6
font_01_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 17836 bytes
SHA-256: 530c74a4c2251fb5e2bb502b9685357d7adf311e252d1cdccc88d49517836903
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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