Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa59635afec8b987…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 22:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 788f8deb61f1eedae15536da3418c423 SHA-1: 7651d02b05008d8d676fddf5a19fc73a3afbacf8 SHA-256: fa59635afec8b987e05692c6b73ab32873e814ad1c949e1804de7c33f28ba071
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of unknown reputation URLs strongly indicate malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://sterenstein.ru/userfiles/file/5475191367.pdf In PDF document text
    • https://nomortiga.com/contents/files/xamevevigo.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/wigeged.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/wokosojegavago.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/nusuvigokexeva.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/80737461507.pdfIn PDF document text
    • https://wmu24.ru/media/file/jopegoxafenizovenezu.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/97999169872.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/bovifedezaba.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/70549304644.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/34188212086.pdfIn PDF document text
    • https://etimes.mn/uploads/files/favoxa.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/wefekaxolosutowe.pdfIn PDF document text
    • http://exim5.hu/_user/file/kiluv.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/pemurososifevokekirawode.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/94251448466.pdfIn PDF document text
    • http://safetruck.gr/images/file/fozujiroxirezazajumumi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906015759388920.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/mexorerimizaneguvamon.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/toxezerilirevefudebetamin.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612feea2e3b5f---72212542313.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130baaf1fb43---garikanej.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rofadaxisojonojimoxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=speed+roblox+hackPDF 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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 17856 bytes
SHA-256: 3b4caab3b2cfd5ffab9471dddee2986873f55d0c9048de150b9910f8b31caa5c
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10556 bytes
SHA-256: a8d398e6f84d628b17d8ee020799a58b278c9f16ea7d463f5c907319bd2aec7f
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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