Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81d88268fb86c62…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 12:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8825c72f39301a1cd027ab97068c1f99 SHA-1: 9bb7d38d815465b1cd60a34d2f560e14efe8da99 SHA-256: c81d88268fb86c6235376fe98e751eea9ff62e041434056e66a7806f4f346e9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs indicate a link farm designed to host further malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130405e5a197---kamatufajawufugubik.pdf In PDF document text
    • https://lee-trading.tw/archive/upload/files/fesuberenubozipodiduvem.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/53006140409.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/visimotunutejizamamamadit.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/jorofuzasofurowabiwam.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/94236279953.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/pusiduzovuk.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/sikatezatana.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/45816338089.pdfIn PDF document text
    • http://rsst77.ru/upload/files/sapukolo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/45946539588.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/82935708672.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/6574004459.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/71085017199.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210905091432.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/lodedolapelibepisukerosaz.pdfIn PDF document text
    • http://calisnt.com/uploads/files/sesumijotolubu.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/vesatalaro.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/balag.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/fakivusemezajezek.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/67937253839.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/58990673460.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/60052044919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=blackmart+official+websitePDF 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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 10764 bytes
SHA-256: 0d9097ce3260b85a6d707f4e5e9fb56ef7a752d9e9d88c6dee8891e24b1acba8
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 17476 bytes
SHA-256: c970f95e39b2f3819eed86cc18992042feaed0c4062613c1a99edb0b37406327

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