Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc8a575622f2294…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 12:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23877680af42ad6c35e116f63b84a81e SHA-1: fd7b08771a9ef24b3af7eb132882c188aad6ba25 SHA-256: ffc8a575622f2294a29015d94215b3fc0697367bd07ae3803b31db53a6d9433b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. The primary attack pattern involves luring users to these external links, which likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laxycoffee.com/upload/files/88149199336.pdf In PDF document text
    • http://c-six.it/userfiles/files/33330105095.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/65894943444.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/nufebavomerom.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/65143171649.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/ravematokitefobibamevage.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/vafevuvilabefugiximele.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/39599121549.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/sejipizirudulaxamisa.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/jatuxefej.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/tisejojiluxoxu.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/ligixuwaxoluxigolaviv.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/14504196634.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22c2c91a5---xenafib.pdfIn PDF document text
    • https://successalpha.team/upload/files/28807580827.pdfIn PDF document text
    • http://adice-area.com/pictures/files/titidomazumafot.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/merazekidiwulisegugidarul.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/17134012779.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/67215602429.pdfIn PDF document text
    • http://vuason.vn/upload/files/nurisimeve.pdfIn PDF document text
    • http://origo.ws/userfiles/file/33062720252.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210901222721.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/kunejumezusanabamugawozes.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/2181739748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+terminal+editorPDF 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_off0000b1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 10220 bytes
SHA-256: afbc08bf62c139713cbf74a2cf38a915219eafaaa6d5c135e30529342d601b9d
font_01_sfnt_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 16700 bytes
SHA-256: 26d6dbe8c5fb14768920bfeee745e6992df6130233a2db87d425eb39afc91d1d

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