Malicious PDF — malware analysis report

Static analysis result for SHA-256 b097735e7c9a3a8b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 05:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d927b96bf916b8da666e0db6b29ba2b SHA-1: 4b2d90f2180a8c6a46e4328ffdf4609b0667f77f SHA-256: b097735e7c9a3a8bc697ec8459e4b289c0b9e8fbcef9a86fc94b4d95cc03e0ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/24d8243076fe3ab2be07ff380e79ed83/24099560225.pdf In PDF document text
    • http://premo.at/userfiles/file/mibozatezubijodixoguxil.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1eb64217529f070919558d5202a401a5/fupalesovekovafon.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/pidovijifuboroxudefoposen.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/bimemix.pdfIn PDF document text
    • https://tigapilar.com/upload/files/90656066300.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210927184620.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109031743473535.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/38394096825.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/39539713063.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/56425102022.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/84315371724.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/31651341011.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/musudiderubetikiforew.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/jineborarin.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/69922136331.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/58333716743.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/juvolejekero.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/begixogixusonisikuji.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/99425295583.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/wavawulutidajigojamobujef.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/69678182786.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/pijetexolelikemodisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tetris+multiplayer+androidPDF 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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 15304 bytes
SHA-256: 863677b4d817fc421989e9fb16a4426f0d3a3ed14645bcb1ee74d0526a626b3c
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10728 bytes
SHA-256: 8b34d0c410b6cbdfc3413588dd88932d51e689dfbe4a456ed3a8c6f3b2e382b9
font_02_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1