Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c730575996646e1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 19:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b53be5139da67a5f56eaf3b9ceec985 SHA-1: 2b23d2cf5d45d7c8bcf3af0af7c744bba1b5a067 SHA-256: 3c730575996646e138e457c55c69641f3af9ef2ffa990fd53ae658ec19440821
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely attempts to trick the user into installing malicious software by posing as a necessary browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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://ibshospitals.com/userfiles/file/88709131376.pdf In PDF document text
    • http://www.pacautomarketing.com/file/22396807732.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/sakesaz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/jepupasubukodamegigoj.pdfIn PDF document text
    • http://carbonelite.ru/file/soxomilomikisopudijob.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/83127739001.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/19555070718.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/88605559576.pdfIn PDF document text
    • https://harom.ro/files/file/48362374856.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/37113128157.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/30d273f2f05cca7f6f36e7e463131732/36136033250.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49512491435.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/nuxorawuveputuwom.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/famibune.pdfIn PDF document text
    • http://besteva.com/upload/files/sitedutidijezizadokora.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/futiwiwenavokusokoniweze.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/mamov.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/23974293103.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xogowewojevidasefojuga.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/84644573935.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/87014098406.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/66420159369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+block+a+domain+in+chromePDF 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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 18156 bytes
SHA-256: 272ffab9da87bf3340d4b354de270d17165b8e3dea7ba7e0cbd3b9e61f860b3b
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 10776 bytes
SHA-256: 282e7979b72dfd76f260c3454d623327547f6b9ebd8e43412c43cc9817cb35da