Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10cdf6f681932f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 14:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a46599454bc87c93223c53a05cd760c0 SHA-1: f06ef04aef0236f8f4ab8357b1ad7e94550e8e41 SHA-256: 3f10cdf6f681932f238813dd9d23fcf0eb52b41a627757e7f66bde4b6e444fe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=inequalities+rules+pdf
    • http://bmfjhjk.friend-match.com/upload/files/novir.pdf
    • https://leresto-niort.fr/images/userfiles/files/88682215995.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8ql5r6bss9nf797nvd41h8nali/11310153818.pdf
    • https://grandhotelushba.com/userfiles/file/jonepumujule.pdf
    • https://truonggiangcompany.com/userfiles/file/4248785862.pdf
    • http://rs-entp.com/upload/file/27126646992.pdf
    • http://berbun.com/user_img/file/23976137709.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/99863884445.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f1bb0aa4---12142524210.pdf
    • https://mondoaudio.it/img/uploaded/file/65174318868.pdf
    • http://redigonda.it/userfiles/files/90030544859.pdf
    • http://fluitec.fr/ressource/site-image/files/dudofitemukululum.pdf
    • http://friulanamarmi.it/images/file/11614518609.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tizoxapowapasipadapeter.pdf
    • http://szjglaw.com/uploadfile/file/2021091003362573499.pdf
    • http://faradbox.pl/files/file/56783030275.pdf
    • http://cmuniontravel.com/userfiles/file/momugogonifawebamexu.pdf
    • https://mimpiindahsatu.com/contents/files/wosisijopagepepumixexen.pdf
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/42352021080.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/37038710212.pdf
    • http://husplaza.hu/editor_up/bafojupuvu.pdf
    • http://hijoin.hu/editor_up/bewumegopopuk.pdf
    • https://guineaservicesproviders.com/gsp/files/metovunuzovo.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_off0000d5d2.bin
c4da5b6e13553fc542eb0399d232f42e5f07e8297d9fbcf8df00d0bd9460e3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 17332 bytes
font_01_sfnt_off000102a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 16792 bytes
font_02_sfnt_off00011abc.bin
3b823576f9ec1eeb1ad3a57192824ab3ebee55e26b8f6bfde1b7a053dcfb9de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 10568 bytes

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