Malicious PDF — malware analysis report

Static analysis result for SHA-256 13480d9a0dfe28b1…

MALICIOUS

PDF

90.6 KB Created: 2021-09-12 07:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93cdc5597cd35fbb0aa446514e182248 SHA-1: 61fa1673fdca045c3a5b05dae44a8d458d660f11 SHA-256: 13480d9a0dfe28b1824021e1a8c78691d08c3148e2b37ef2a2186e96b61af96c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The primary function appears to be redirecting users to external sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kahounova.cz/userfiles/file/63243118483.pdf In PDF document text
    • https://people11people.com/uploads/File/taworugodunigalaxoti.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovu36gmmnajiv2khgn9t1rdmaf/60459831458.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/tavokasudupot.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/83943241838.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/59986028882.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/69958185924.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95804109646.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909034838.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/78525077600.pdfIn PDF document text
    • http://foxadv.net/file/juzedor.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/wuruziburine.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/85959911530.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xaledaneba.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kunawab.pdfIn PDF document text
    • http://drironcat.com/images/file/jegajijesate.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/12264188794.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/gejegatigokexat.pdfIn PDF document text
    • http://ge-mak.com/files/82842797077.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/kukago.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/88993677463.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/9293345257.pdfIn PDF document text
    • https://profm.hu/files/file/13688081621.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1baa44c2f72821adbd0e44730a52ccd/96365587976.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/18750803475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fabulas+para+imprimir+pdfPDF 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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 19804 bytes
SHA-256: ec970e0eb0c1d74016a91fc450b717eee62acb7d38007db679bebb4b537936d6
font_01_sfnt_off00012bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EB 10424 bytes
SHA-256: 701afa8d7a57c01b0126819bef599633b309296552cb3130aa2fe9ff028e6ece