Malicious PDF — malware analysis report

Static analysis result for SHA-256 38389e44cd347760…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 08:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70c37c6525eaa6f867ffc5e87ec89a19 SHA-1: 0ee5b24e9f55906c56958e5bb6c38c82e8ccfddb SHA-256: 38389e44cd347760a673590bbd82b28dd411000b50124fcfb774dd2cdc35fbe1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://icsbc.ru/fuploader/file/bufatoposu.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131273b418f8---fogafewenemeloxutosejojex.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/78783816103.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/93846486363.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/81093041285.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/68644612749.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/5117665461.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/62700029689.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/12095745328.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fulosotagutigazepomozokab.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/fuzofogikevenewuso.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/27130393926.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210910232252.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83qquiu5fh945v5ultvb0kdfi7/luseki.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/tulalojiso.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/dememilutib.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/zidixezoted.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/wunudisifub.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631259341.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/telik.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/60970687646.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/zopufigejuwupezisumeva.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/nebajanorugijezibedoje.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/beratufiboselepajibote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+android+sizePDF 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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 17484 bytes
SHA-256: c5414104b8dda1393be09c4158a1cdd3cdd1212305b8bd7cc1530745a8105dfe
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 10428 bytes
SHA-256: 47e02824a8feb212905e561fbdec736e6418407710f7ac18508f4ae5decbb92e
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1