Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c807cbc24ab48d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 10:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b819ef2dec691e5b79adea4e01d37cf SHA-1: d26b4894514834b2e92123aef5056f2d17d4d01f SHA-256: 44c807cbc24ab48d032e1364f9e6d9fe467bead36b58bfefdc6168738301d763
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm structure designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seeyounow.net/userfiles/file/konap.pdf In PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/82286574213.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/mibakij.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/37386112604.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/3388144300.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/rabume.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/84305918407.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gidoxatovofozunadeb.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/47241979348.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/79833948598.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/51626797575.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/10620547523.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/vapexen.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/11395939087.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kamexurowe.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/luwipala.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jukofa.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/57062590465.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/91954817608.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/mitaralatuxebakidesugupin.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/pemir.pdfIn PDF document text
    • http://honghuibio.com/d/files/63078450395.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/9953339860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bunny+skater+mod+apkPDF 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_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 10776 bytes
SHA-256: 3466e230dc83e3236cd5919594554936ddc20d3668f770402fe82b66dc898341
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 18104 bytes
SHA-256: e1058b6851e80ca1a036206b3e0049d261d65b175462348b763396f5a942901b

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