Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc3785b0c5b4b7a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 21:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e5ea955c873c0b07fed919b986ba9a76 SHA-1: 5ab8f90c97e9e8d0d1e1eab443a7b9db2978e960 SHA-256: 3cc3785b0c5b4b7a75a0c70b236214013acecb19817e2f052ac525647870bee8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. Heuristics suggest it's a non-clustered link farm on disposable hosting, with one URL specifically mentioning 'ps2 apps download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=ps2+apps+download PDF link annotation
    • https://flavio-tonon.it/public/file/35856171914.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/12727260195.pdfIn PDF document text
    • https://fuoriscena.eu/file/dikarujubokarowajijigebaf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613caab7e74df---87287502806.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/47170898859.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/35535015895.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/dagaxunudobajokubev.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210904_044952.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/wexobiwumexiximul.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/1778222824.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/xegamagu.pdfIn PDF document text
    • https://almavilag.hu/files/files/21479866790.pdfIn PDF document text
    • http://aweibel.com/Photo/file/safujozusuwaduroxitile.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g6ec4svqghhqsihmeripcr3r7p/nurawaxesidapuvoku.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/vatidukefuzeliluvizimun.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/vixetaroma.pdfIn PDF document text
    • http://rc-modeller.se/images/file///bujafoxuze.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/62821770176.pdfIn PDF document text
    • https://bfull.ru/uploads/files/60414190352.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/9594087047.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/fuwejuruvafunukirusav.pdfIn PDF document text
    • https://viettrungson.com/media/Files/36071079017.pdfIn PDF document text
    • http://imbirimbir.ru/files/92273551463.pdfIn PDF document text
    • https://orrizon.ru/images/file/gogorulebu.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/denimiba.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_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 10172 bytes
SHA-256: 20e8639436ef01c5ac36c951a4a214e443762c878f9b6a7b03754baa9d3231ed
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 17044 bytes
SHA-256: 071b2afa4f775391f938d3c3b59f8b7da506f6ccc0a9b79542bc7c25fb86f928