Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf83376c4e13d44…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 03:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2014ee1d6277c6b056c51b51b66aeb4c SHA-1: 66593d95e12865956ebdaa5dbeb4474fce6ccda0 SHA-256: caf83376c4e13d44917938103f0f25b2a6032146c744dcd7a7951ef7c70a05fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://santabruna.cl/upload/file/21897813403.pdf In PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/wolitagevukeruwepiraluwo.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/14842943431.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/lapurubutefuwowezilo.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/49028364645.pdfIn PDF document text
    • https://cartolmania.it/file/nolenuwudakajulasokatoj.pdfIn PDF document text
    • http://apex-architect.ru/images/file/19896371202.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/jifuwuzaxiwesidagujali.pdfIn PDF document text
    • https://2acontractor.it/images/file/20632441524.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/lunabapodijujutonawajimu.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/divufafexozun.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/bavinex.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/12140148528.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc2bd529c---78780486680.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lakusawotu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/32841763097.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/36815894477.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/53675357271.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/vaketogofisinafo.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/zuxafanosudadurabime.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/70364655604.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/62820944928.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xafawebufijalonefox.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202191652364647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ringtone+metal+gear+solid+alertPDF 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_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 10636 bytes
SHA-256: 05d579475882de5db33ee5068da2d82be1dfcb2b4690a9bf76b4060021e7e27a
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 19720 bytes
SHA-256: 63e7823ac785821e04af5340d4fbd6e13315b015ccd726e48d7ec0e95b8e0699
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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