Malicious PDF — malware analysis report

Static analysis result for SHA-256 beecc9a2b95bfcdd…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 17:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5fb563360186872bba95a3733b6ae9d SHA-1: 18cb2898a05624de8da5b7f12c573d9beaccd98e SHA-256: beecc9a2b95bfcdd79b69d795756c40a5b7244222691d5e77e61478b18c6ce60
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to a link farm, with one specific URL identified as a potential redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to direct users to a collection of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dxczx.com/ckfinder/userfiles/files/20210904_152053.pdf In PDF document text
    • http://pankajplast.com/ckfinder/userfiles/files/nosodemasukedaxejanevuw.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/remurumedezenig.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/lodaranenesanowi.pdfIn PDF document text
    • http://asfalon.com/__files/file/wirepasutiwuvepewegiti.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b83b1f7f---jimulevetetamivu.pdfIn PDF document text
    • http://alcantara.cz/data/file/rixijujegofuxokotepar.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/57521043308.pdfIn PDF document text
    • http://446888.top/userfiles/file/lofulunoluberujejegilepu.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rinomoporabuwisagutev.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/witigameded.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33480994046.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zuzosukowivupuzezogurawe.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/megubarusatife.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/14882811577.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/51405621695.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/zirefaku.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/8627688001.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/78540133739.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f848b66ee0---12442336089.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/zamomofekabewufisotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gif+wallpaper+android+4kPDF 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_off0000bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 16556 bytes
SHA-256: b9dbb634476a50faa6ea85fca1699269dde4a103a16e0ebe38eca222a86f30e4
font_01_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 10520 bytes
SHA-256: fad33bf90a71965bb0d4452fdc11d6c2b25d84d1c13fbec54fca9bde85061566

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