Malicious PDF — malware analysis report

Static analysis result for SHA-256 42167418aac73ca4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 02:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 439c5674a312d346bea06ae6caf110ce SHA-1: 566f0310e2283d5de212842a410489f57269cf24 SHA-256: 42167418aac73ca402d09ae612ccac57b5bdf9bb7185f524a8065f8032b3dd04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pusheng168.com/uploadfiles/20210909110955.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8042ee1bc3c93a72d98aaea4fe1fc82b/beveza.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/dijaxumejolaxasezo.pdfIn PDF document text
    • http://balalajka.nu/media/jenufifadijaxozirunizaze.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/desewesu.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lubufelunek.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310572656514.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/88105925065.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/silepowunusidefibaser.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/29020196184.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/fupevigufiduv.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/34265163092.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/92974618471.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cfec0da8---mixobijuwonofijukozapo.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/77509177749.pdfIn PDF document text
    • https://korankertas.com/contents/files/68106607023.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/40382792440.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/doxililavasowa.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xofafeg.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gebibuj.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/75660215573.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/69067952644.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/jevanapudibusu.pdfIn PDF document text
    • http://ned.ru/uploads/files/kelubodaf.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/93786940520.pdfIn PDF document text
    • http://pedraferro.com/files/files/xajifexanide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+network+analyzer+app+androidPDF 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_off0000b6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 10792 bytes
SHA-256: e63552498c1078c3c1df75fe5a1ea1ab3b49b5e285b4312fd0fa70704fdfa861
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 15556 bytes
SHA-256: c36d03729cf8badf27d22ec5ac6887444009c2d2f6b31515e4964d9f24d1aac4