Malicious PDF — malware analysis report

Static analysis result for SHA-256 50002747c0433381…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 22:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e69bdf88b9d1546c0a42d6e41a233923 SHA-1: 57c6e9c35e9f7854a4c29d61e49eedf5e52aa91b SHA-256: 50002747c043338168f600d8a470bef7ec4cd705733c8e70591c2b75f5017e35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=y+6+letter+words
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/legiwesixudanekafeni.pdf
    • http://bolt-go77.com/fckeditor/userfiles/file/42375238132.pdf
    • http://drairtools.com/ckfinder/userfiles/files/91451479566.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909083627.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599552eca7---30974349539.pdf
    • https://systematix.pl/userfiles/file/vebumoriten.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/retukin.pdf
    • https://rhuyscampingcar.fr/images/files/4863737176.pdf
    • http://branpc.in/ckfinder/userfiles/files/gofunex.pdf
    • http://levakov132.ru/userfiles/file/27028605944.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/mixotivekiretemiveva.pdf
    • http://preiss.at/upload_files/files/rebomoxiravinarurofaw.pdf
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/99761638386.pdf
    • http://selidbe-beograd.info/files/81970334567.pdf
    • https://sanmuabancongty.vn/images/content/files/20532113101.pdf
    • http://siciny.eu/userfiles/file/52407727472.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/dejasivar.pdf
    • http://sushimura1.com/uploads/files/15096069207.pdf
    • https://nevjegyzek.eu/uploads/file/majuwisinorumasiw.pdf
    • http://pyramidplaster.com/file_media/file_image/file/bazunivomarej.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/tufon.pdf
    • https://aordonez.com/images/contenidos/files/90130922230.pdf
    • http://samurairamenbar.com/uploads/files/duralapidiges.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17e.bin
73e074478a7508993aae4f0bb5032b340feaa493da3a6c7d94623e5230d1764d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 10120 bytes
font_01_sfnt_off0000d85a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 16792 bytes
font_02_sfnt_off0000f06c.bin
1059ef70b18542e859689463a540870fa76a40a2aff8e4de77513fc3d501ec87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16356 bytes

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