Malicious PDF — malware analysis report

Static analysis result for SHA-256 725f5df0ddeb4c9e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 03:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a8ddb1820cb19740438a15061e73538 SHA-1: 3627985654b97613ba8a7ad7f97bfd212270c887 SHA-256: 725f5df0ddeb4c9ed59787c534090e346f4d0af52e348c080dc9a1a2b5747e5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=recycle+bin+apk+download PDF link annotation
    • http://bordahusfeldolgozo.hu/editor_up/jefogezuwuripesorimo.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/49826818124.pdfIn PDF document text
    • https://magerp.org/upload/files/31396802385.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/nutiwuzivedig.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/17140088560.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/99584771239.pdfIn PDF document text
    • http://korytnica.net/data/files/gadujezijek.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/nefewazasudu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/44199881956.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/98300899625.pdfIn PDF document text
    • http://signauction.net/userfiles/file/guxunevetimepuxixin.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613641d1ca559---lajife.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/rapuguwununilufime.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/xozot.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/81121595959.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/balimigupusonul.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/gapezet.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/woriworonunakakak.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/vegiwo.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/39919484040.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/87758031779.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 10620 bytes
SHA-256: 02422c96b4a6a0685866d63427b28f3d94830933bc8589caf692665d5ed80c01
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 17892 bytes
SHA-256: d9ed6a3b3fba874932e433e55f105637b23b4e261ea5767b73e2bfaaaa1d30f3
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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