Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb6c1f71a1d40e9…

MALICIOUS

PDF

89.0 KB Created: 2021-09-14 12:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63ee31165df2e2604cdf6d531df50978 SHA-1: 1f86d789c2fc16f02b35623494d126efdd989550 SHA-256: 7eb6c1f71a1d40e99bd2a156612a044add34b87b9f1ca35798d5e3a789d11905
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a distribution or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=doraemon+comic+pdf PDF link annotation
    • http://nikkenj.com/userfiles/file/xumunovedivivewikivojijo.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/fofogorizinuweredotid.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/71631650086.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/giwisorid.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/fodawuzekuwasaf.pdfIn PDF document text
    • http://adriennemason.com/assets/files/59905476020.pdfIn PDF document text
    • https://timminsrenovations.ca/file/jhi10tFdrEFuLdyd.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210911151114.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/buwepinufazigazofimi.pdfIn PDF document text
    • http://alvitraders.com/files/41558153923.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/13652791253.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/peborozezenubavu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/87664416436.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/livixox.pdfIn PDF document text
    • http://ave-france.com/pics/files/nagejaxowenizojamerasebak.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/89737251674.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/rerukizega.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49acc830a---43115829908.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/gerepiwiziwerofuvozinib.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210907_080030.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/rejidi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/48025608504.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/68751175782.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/76199168827.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3d68305e7bce69ca639d28b1643f8ea8/96371750429.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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10472 bytes
SHA-256: c39c33a7b247d219d7be6c5e7135b748aa999b31c4da510e795e88885aba18ee
font_02_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 20392 bytes
SHA-256: d3f66b713329bfc8c2ef8bd05c35646fb4e22f05b3793d6bcbbe412aa7339ca7

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