Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d193a256745994…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 10:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff7631a8e775e7812c59431128e7029b SHA-1: b7d60e874b07894180bdb6c6029a25e871b48a48 SHA-256: c3d193a2567459946ba6a8fb729a9dbacd7f6111bff263fa6c9dc2cb2b2155ee
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a high ML confidence score and ClamAV detection indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick the user into installing malicious software or providing credentials. The embedded JavaScript likely facilitates the execution of malicious code or redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://smidgel.ru/uplcv?utm_term=photo+p+apk PDF link annotation
    • https://hazeloyun.com/calisma2/files/uploads/powevosokadarexi.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/75674205807.pdfIn PDF document text
    • http://gardatrans.com/content/Files/ritatawoluto.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/xapukozude.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/sixajaluravapumowis.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/16381618466.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109012201179836.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/sexumaxo.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/fipuxukudumisotopas.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/70554250465.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/ralenos.pdfIn PDF document text
    • https://southafricapools.com/contents/files/86438995906.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/zitifelu.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/89074078337.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/43022462797.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42231762633.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/83790004828.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/suwezujafasole.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/kiterak.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/57511372152.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/ganufewapoturugisifazoxe.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/salawog.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/bifunemijeruduzizubero.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/8512422959.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/90959720619.pdfIn PDF document text
    • 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_off0000b5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F2 9800 bytes
SHA-256: b8ad612213fe0ceff277bf412666e5611ed7e9080cc361b6b839d7c34f2fea77
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 15512 bytes
SHA-256: d1588052d564a74791829d65c9a71eb2f1067b67b91c01bfbafd7d4003cf1d9d