Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e31fefa128b710…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 13:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 1bf153fc327436e0ee9c7090d0770067 SHA-1: c04edd3b36f187d19526d77d9538f77c7ec04ecf SHA-256: 76e31fefa128b7104cf13ec4d4efd090bd52a7a9233ae787ac0d9ede64f5eb0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tortsurprise.ru/upload/redactor/files/giwuragige.pdf In PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/kakotadarufipabodifanu.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/27251086557.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/deea19c98ca1c4eead66b998af5252d7/porid.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///nepawanurojilominuro.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/92212111429.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/45579299120.pdfIn PDF document text
    • https://basisangka.com/contents/files/56038777045.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/8217119126.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/38158973038.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/91853075958.pdfIn PDF document text
    • http://fxlcd.com/upload/file/nivuwaret.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210912035542.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/33260827866.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/86150044165.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/49634890166.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/folovuwoze.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/11935889559.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gapugowijidabuxipikap.pdfIn PDF document text
    • http://sbairs.com/datas/files/rukovuxevibugejazen.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/mufivarovobomu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aa3753e111cdf8f494c8214e99c88fd0/bizigikarizefesop.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nelowixumoliseworurunop.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/palaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+apk+for+any+devicePDF 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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 19952 bytes
SHA-256: f9a226fd691cea6ee571e7535b4137802be8706947ca7d694f3f7184a02475f0
font_01_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 10648 bytes
SHA-256: 2f9d326df7ba8caac08f55a8b05cba2259f6649e6df6253fb7c5b4ca1758b154
font_02_sfnt_off00012fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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