Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc27c76f9986776b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 17:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a74e41ba1581bcf7451c702c2b9081b SHA-1: 7628a1472c498045bc0aaade53d5dce4daab502e SHA-256: cc27c76f9986776bfda20d43c9e0b912f367dcfa59bc7ea3805c752165d8666f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of multiple unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ahzgbh.news-read.com/upload/files/36710766207.pdf In PDF document text
    • http://titusauto.hu/kepek/file/63313549295.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/fuguxafasogudezopakanus.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sotatezitos.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/73349064613.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/58576683506.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/5130432807.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/90011290332.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/74347914643.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/29202989811.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wubiwolubukerepujoreju.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jamuvixobixakafuleduv.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/46866128150.pdfIn PDF document text
    • https://granitnet.hu/editor_up/pirevakozan.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/tuwul.pdfIn PDF document text
    • http://medi-sen.com/files/files/79517424133.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380442921aa---lotimudezaludorivefuviwi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kezobafaxep.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/kafuvun.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/pulilab.pdfIn PDF document text
    • https://emenu.hu/editor_up/fifewajajadalituzupigepid.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/guwure.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/92116102420.pdfIn PDF document text
    • https://equalland.com/uploads/File/94010558783.pdfIn PDF document text
    • http://stl-hk.net/userfiles/kogalewitokif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=crisis+management+pdf+booksPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/mokitadezogox.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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 18132 bytes
SHA-256: 6cdc1a9fd6eecfb8ed7b792fd187c216ecef63429215c516e44c449768721879
font_01_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 11060 bytes
SHA-256: e616694f61afcc189fe57a94aa1ce8a0cc12a699303af7060952d8203e7788d8