Malicious PDF — malware analysis report

Static analysis result for SHA-256 090872b23ac7c92b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 17:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c64eefbffa0ce32a2d8b83b4efa08e6 SHA-1: 6c83b638ed2d965255a16c32a5f78d8e785e35fc SHA-256: 090872b23ac7c92b3270afcca698ad2304f0c5f97bae8afc98fe514b630aeced
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates potential for exploitation and execution of malicious code.

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://massimomoroni.it/userfiles/files/juzusikevekodemili.pdf In PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tomafunotowiburagakolafit.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/bupewitijik.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/43255809071.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/4999855118.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/1735093136.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fajavu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8f1bbf8c---7345541626.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/87643539638.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/64962471076.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/xexabawiparufil.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/71960101166.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nobakadifizebovokiwetiw.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nogosaripa.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/ramasudapaxari.pdfIn PDF document text
    • http://leruichem.com/upload/files/soripowoxinudagigijoveja.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88761271924.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/daporivib.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/87167266036.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/53445029951.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wozomiwelarew.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/87371753786.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/vazovomelejesula.pdfIn PDF document text
    • https://sapporopools.com/contents/files/toxapinewadigonunewuva.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/robumepokizukogagop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=john+cougar+mellencamp+i+need+a+loverPDF 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_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 17056 bytes
SHA-256: a358dbcd0679d77ae67c8a16f28ad1ac040a7c5c8b3eceef29968c200b194d9e
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 10852 bytes
SHA-256: 6d1860b40c612ec73abbaf66e369a87ba920106c869eba643fd70f16f83a5370
font_02_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1