Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9769926c95a3db6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 06:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 82ef73e85017ebad1c9a1f3b49c58240 SHA-1: 173a56ceac84996b21b6cbfb6c23b274355ea7ff SHA-256: d9769926c95a3db63b720e92d58d83ea349fc09a19d9fcde2da90580658236ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic indicating it's part of a link farm on disposable hosting. The primary malicious function appears to be redirecting users to other malicious PDF files hosted on external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pointwebhost.com/calisma2/files/uploads/mipixuvezed.pdf In PDF document text
    • https://salwangurugram.com/files/11748133832.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/13140015180.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/fosurolo.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nefewo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4b89917537e0ec16f56c8273e2f08e1b/68425088078.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/jilebitozakaxirajebagovi.pdfIn PDF document text
    • http://hkwwta.org/userfiles/fizerepiwipetoliwigurif.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/38596062242.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/89783806058.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/ludedorosiwubuduxejo.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/75446730409.pdfIn PDF document text
    • https://mkart.it/uploads/file/tiwigak.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/68633124985.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/27807046598.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/66204450996.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1ae5cd4c843d87bfe9c986885383e92e/pijab.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109011554449497.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/28628840991.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/voseganititadugepimaxufig.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/27647264718.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=class+7+social+science+book+geographyPDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 17240 bytes
SHA-256: 9f4ea5416ecd1ec9447c1050adfb685b12b45bb3f11a667e659edbdec11b1318
font_02_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 10980 bytes
SHA-256: d53b93bf8800499c66e3e83ce00fd64e246cb3b35502176345f64d69d1f47275

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