Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43c5d6f317ca179…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 15:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56355b78d8638921144f985ec7adefd5 SHA-1: f472a1e606c964ce04777517dc633cc9af802643 SHA-256: a43c5d6f317ca179cd43bcb0144ab4dd946e43a0434dd74a0e8eda36e2ea5646
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The presence of embedded JavaScript (T1059.007) suggests it may be used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://taumed.kz/upload/2021/09files/210917042649297419a2riy.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/vinifuduzokekaxuwutipar.pdfIn PDF document text
    • http://tinhotsaigon.com/uploads/files/vakug.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d526a08d---45978905854.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/78102363022.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/sodijobetifoxok.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/fatonemiwuru.pdfIn PDF document text
    • http://jawarakreasi.com/file/votoz.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/27840542745.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/juleke.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/9108040711.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/januwa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88889841c---36538870385.pdfPDF link annotation
    • https://grupa-energia.pl/attachments/file/73731827801.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/15190422826.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/sevoserapurasawawepip.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613194f917881---dotokida.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vepuwamowatififizit.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/vupilizufuvidadenide.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/xovafovokikimetanepogo.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/gosoxu.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/65640380067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+scroll+lagPDF 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_off0000b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 17756 bytes
SHA-256: 09ad2337f734dcb57c0d58c5ac6eb9b6a87c2b74acf66ea684da5bf66e5afc4c
font_02_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 10296 bytes
SHA-256: a31ef61f720902cb00dc313d23bf6ad66e2acad0d97285cf1d2415e808ad8609