Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd12d5978047d011…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba8e44ef133e3d18dfb73e8037e149ef SHA-1: 646c1dda190cb0d1f5d7c1cdf897efafae29c38a SHA-256: cd12d5978047d011b820a30a3dd0b08a4d8d0a926b9e73afe1d460e9771c1dca
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are disguised as document files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to manipulate search results or distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=bin+bulaye+baraati+full+hd+movie+download+filmywap+com PDF link annotation
    • http://rheumatology.institute/upload/content/file/tuxukarajozugoturikev.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/koxabujupofumekajesixo.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/sijanamikuvade.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/bulunijewovixuje.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/lugojewizabofowe.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c448e0fac7---purelobowomurenobif.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/2834586070.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/jegeroxanojikolavosa.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pufewuvoveratikawuzadevo.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/19382227337.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/33384353591.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/raranupexemasapolubegob.pdfIn PDF document text
    • http://dezis.ru/uploads/files/24701501080.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/xomudeno.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fuduwumedinudasizuridun.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55656399065.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/palasokafesu.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/takeve.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/7154458278.pdfIn PDF document text
    • https://breedlife.com/upload/files/80117824866.pdfIn PDF document text
    • https://kaparatt.com/images/File/358450912.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/41527304804.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/4619690041.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/kofateropubaj.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/45339773135.pdfIn PDF document text
    • https://proia.bg/userfiles/file/wukur.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140503ac72c0---danigas.pdfIn PDF document text
    • 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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 17140 bytes
SHA-256: 0c95df6d50a18e57232f8ad0b31a25f9d9603166cd8c699e6ec2b86f2475cb57
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 11276 bytes
SHA-256: f43c3c6372f773ca44a03234fa3e632ef13c8584dc894d31c3152cb9e3202adf

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