Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62ee1d9221b7d18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 10:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc946023960b4d3dc1a039d3d089ffe3 SHA-1: 7cdc453b81d6b6581d3023afff7a9ac489b70548 SHA-256: f62ee1d9221b7d1839728004995c8acf6f5db931dd61cbee8a174ae787984677
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://archism.ru/uplcv?utm_term=mod+apk+of+wcc2 PDF link annotation
    • http://litho-and-co.fr/ckeditor/upload/files/20742386652.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/30179886571.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23254740380.pdfIn PDF document text
    • http://dakmet.pl/upload/97075315319.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/77393512442.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/maxemep.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/mexuvinosimaf.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rukawurisawem.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/xibosipanogonimekutenukil.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/75sk0mr5kj35ndq6oqtlaquiu4/91688600834.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109080518592207.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210922175313.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/junuzoberazonozuvomo.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nofozawuxinebedeki.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/67299991128.pdfIn PDF document text
    • https://msiutilities.net/documents/giworidisizanomiduzisag.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/93871316725.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/mumazepazopobajotazujaw.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/1449579796.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/bijejisivatifujazebex.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/3508685915.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/nidotur.pdfIn PDF document text
    • http://ruihuitax.com/files/file/1235061654.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/20394413368.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_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 17724 bytes
SHA-256: f1bcbfe1f9606942f7dd9890f39d8976e04352f160bc81e14c030c3d565b6a54
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 10164 bytes
SHA-256: c1efaf48c2bf2972f8875d87385361f91d6a8cff19b07be5e4747f3deaa93c0e
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1