Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b1c93d44b9cdeb…

MALICIOUS

PDF

76.7 KB Created: 2021-09-25 04:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 584f58a3982547c3d3fef81ceffcacf5 SHA-1: 491ab837a80536feaff9becf589730d56007070c SHA-256: c7b1c93d44b9cdeb70c7c72d5b8555cd4c3e8e9e287646554da39ac47e041e13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=tales+from+the+shadowhunter+academy+read+online+2 PDF link annotation
    • http://e-sheremet.com/img/fividugemufozirexi.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/44311625288.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/lozopevadikutefoxomomo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614de48e834ff---daxugiwanul.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911032357.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/bajawokukuwageginapiru.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sedopavuz.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/99814619961.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuziw.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ce971c34d---32603978143.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/21824583567.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/93760578171.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/mosoz.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/64168499742.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/dadifipedituninukezinurem.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/sakabipu.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/nuwivovokajukozurepi.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/89845811882.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/43879846939.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/jejarepexikifa.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/6646650465.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/dazej.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/sodibelelubuwokatomafeto.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210924082327321554m8g8j.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_off0000c011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC011 19400 bytes
SHA-256: 602fdba73de5b3d270e7559e599009fbd81b1544a06d10ca05e2e1c61f4861bc
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 11124 bytes
SHA-256: 73c00b61698f1ed43aa8218cf766a2cdc5a785121ac97e02a923014de88932e9

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