Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a7db032c1343d5…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 16:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c09d7d12597d4c01cd0751dbc2656ac4 SHA-1: 2a0e046589c684a21dfafe274a1a76c3b1fdefe4 SHA-256: 04a7db032c1343d5debf0ec7ccf12d83679fdcf94982304cde4a73f96a59c7ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains or IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=mp3+azan+ringtone+download PDF link annotation
    • https://topclassgreenery.nl/images/file/87960593916.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/pilirevobofumiwiraf.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/viwugefofugopak.pdfIn PDF document text
    • http://szcftz.com/upload/veraloja.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/sigidiwu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47356097918.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/60293068951.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/molikaj.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/20742930012.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/wadamazol.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/73948966540.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/kemuragis.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27779658636.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/vasawog.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/11143972530.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/lasujuwow.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/nasowijibolof.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/67804703566.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101398d1fa---93275123491.pdfPDF link annotation
    • https://gs-hemeringen.de/ablage/userfiles/files/55840750360.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/vulofizosadakamox.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/19346731189.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/wilotir.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7daa18bb9---tajunigekakaral.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunefofamu.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_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 10708 bytes
SHA-256: fa3fa252d41d7b6d416a43239d0e0bfc92e25e38d49aba7725e9396cf36a66e3
font_01_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 17660 bytes
SHA-256: f9e5124742f2326987aaae8ecc4c952130c25d227e513930e6d58b3752d65289
font_02_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1