Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e91be79d91cbb95…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 08:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c36f4dd68dfe75e37a5924184d386d0f SHA-1: 54b077dba293b79e75a475b5539108f02b2a95f5 SHA-256: 2e91be79d91cbb95f46cedf369c59fdc6f30421fe564900b888e52bb6ea889d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various domains, identified as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://himarco.ir/basefile/himarcoir/files/zolemo.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/68518764954.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/1349864945.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jidotusafigogazusures.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/nedawaxitifivevebamodep.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/14029206357.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tisak.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/gedarenumafozizogor.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/vinisapetikazoruf.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/20759683975.pdfIn PDF document text
    • http://tiquital.com/documentos/file/68460451757.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11226232134.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/duximevopipexixu.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jobejakawamajina.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/beboruzaxukedeg.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/pelefelupixi.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pojodexipuxumopikokelalab.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/liwupipisigibodujomeweden.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/84226396725.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090809471073499.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/tavegozerale.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/47511604494.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/88231613303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+development+c%23PDF 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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10392 bytes
SHA-256: ab8effad6be206e4fb24b7da50b7cb0bb74db0c68107b01c7a9b42808e941dbc
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 18604 bytes
SHA-256: 8776665e9930b04e8aeaf99d338482ec884f4afef30950a1f9953dff993eb779
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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