Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5037a7d74d30f8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 05:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c2c3bdad13290f422d7ee72f2fa4d3f SHA-1: c5255d543b2cbf2b0bf7a7de08a6682cdf7ba6cc SHA-256: 9c5037a7d74d30f808ae624dfd39529ec648410f0d553bfae0364522a93502d2
126 Risk Score

Malware Insights

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

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. This suggests the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tumikalitebevo.pdf In PDF document text
    • http://indcms.testingmachines.com/images/file/tiwegukiravavemobugejeb.pdfIn PDF document text
    • http://www.bash.cl/media/file/kukobotuz.pdfIn PDF document text
    • http://mq-water.net/upload/mulizuzogotabimap.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/53476244019.pdfIn PDF document text
    • https://brod-plovdiv.com/images/21059691606.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/kavuxegeresedagimuzen.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/wajudipowopusodedepalinu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/birelogoni.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/65554411930.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435b22b3905---gixukesudotopobuwufaxomat.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/kumazub.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/47120409798.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/78291984606.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/37385223931.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/faxazikilabivurawefaladi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/12281779783.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/mumedorobodositolufirodav.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/84725246692.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/laripoxigomabudojedutuva.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/97609148857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+animation+animatorPDF 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_off0000c2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F5 20744 bytes
SHA-256: 4a11f52b77383b9bb52501099c3041128f3a4b372ea2750f9ae22da97f449b2e
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 10044 bytes
SHA-256: 3b5fc3fde60afe35b39f8e5e2a16e00cef72dfc2fca3e0622e4495c92979419f

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