Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dda007270298eb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 13:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9fe0073dcdd777fe36ad28b93d7f153 SHA-1: 7ee0b4de7c9a62e70501876ba95d0e9db95fe040 SHA-256: 31dda007270298ebb32830989645b9edf30162df11b385e1643a883c9168f194
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting and are part of a link farm. One URI specifically uses a raw IP address, indicating a potential attempt to bypass domain-based filtering. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 http://kdsonline.org/userfiles/file/vuvunapusezamuvajakari.pdf In PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/zekagiligedobonivaluxune.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/dojifugafejovanarin.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/84876996983.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613095e249156---50950998912.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/39161143282.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xagijavexiwomiwoxu.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210913_C6869DA21E8062F0.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/75667286605.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/falasutapibuj.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/jigajuxigikufideleter.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/89517191404.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/bivimavi.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/62533877209.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopuvejafebikepox.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bubenatofajoji.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/72976194635.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/1298474382.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=turn+on+alerts+on+androidPDF 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_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 17848 bytes
SHA-256: 4d60fca11b1509d4145700b8d9230e5b9897680203b67e1502cd1b7e98e14341
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 10304 bytes
SHA-256: 2c0db3cd8b93481d1b3142de941b341a1d909f06df8872f9c1a81e5a974f9d55

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