Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ce5ab4a3539a27…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 14:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef694a8fbfd136bb79eb5e24722a02c9 SHA-1: e5910b7d0705d8b6ce9aecb24b94bea27e0225f2 SHA-256: 58ce5ab4a3539a27ead04af1c59b7b9cefb264b63b1811845d7474d77ca2005d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, containing embedded JavaScript. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, many of which are likely disposable. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious content or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://lyzebrno.cz/userfiles/file/baxavawanokugezanazuwuzoj.pdf In PDF document text
    • https://marupyara.com/fotos/userfiles/file/ladebuzepepepusufejuregi.pdfIn PDF document text
    • https://felicityokolo.com/file/45007172478.pdfIn PDF document text
    • https://forssh.com/userfiles/file/tolosumabegotut.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/tuxawadulebawekajigadiju.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/82147462885.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/jafigupukalolov.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/97331201593.pdfIn PDF document text
    • https://pratham.one/file/59321484601.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/30888028803.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/37731872207.pdfIn PDF document text
    • http://sial.pl/galeria/file/dosajapuvaloruxesawaj.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136043887cba---78348453204.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/6164274183.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/77982498950.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/26502141780.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/47751143717.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/78807624234.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/pivunosewevotuvawozakow.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/paboxaratona.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/lesasudajekugeroju.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/22237311665.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/pafapijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+super+filler+episodesPDF 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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 10816 bytes
SHA-256: f8ca3e097fa3eec042073cb91266be68327208b8cfe9e2c87752f4b33fba1eda
font_01_sfnt_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 16004 bytes
SHA-256: 21aee776154c329979cec5c7a9feafbc3a2910e29a4ee2953a0c28f3c137b2a5
font_02_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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