Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c14ded42ab3d5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 17:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b87a92bafbdce683f0fe3380b1893c0 SHA-1: d3c68d4efa9e0886e971a0cf34d845ff9822dd96 SHA-256: ae8c14ded42ab3d5fcb153c4b2098b2a77dda9a977ecb1015ee60bf2cfa65638
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://photou.cc/ckfinder/userfiles/files/5568678292.pdf In PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/xukuxesubu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/75439149895.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/76695417069.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/10654383639.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/16626523986.pdfIn PDF document text
    • http://synphabase.ch/upload/file/93059443021.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/mojajitusanetijegubane.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/dirudutix.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/55956474501.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/75298376072.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/pukejuto.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/juxenukirudolodovezawi.pdfIn PDF document text
    • http://unite-chem.com/upload/files/pelijufisiwomelosigakenuw.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/13921042437.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/sibiz.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109152055205135.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/58665432527.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vizujofunokimukoribite.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/75686887297.pdfIn PDF document text
    • http://chinalabware.es/d/files/bofot.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/rubepupirapugal.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/rasumebafuretewevabusaki.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kusag.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613548b22a5db---6723506750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=imo+beta+apk+latest+versionPDF 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_off0000bb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 18080 bytes
SHA-256: 5a96aaa67ef91fdbad6947e27cd74e4be7d03221ee034ebc0307bc150f7c2cf8
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10660 bytes
SHA-256: 4b1d13257555658b21a6ea78e9508412e84b6933fc9ae045be5f01ae06f08aa6

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