Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf1c3bcc21135c1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 22:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e331a47c0acc957f5ebc66efd170fb3 SHA-1: b97ce6a890a85948cc4b343fbce23c5199c481e5 SHA-256: 3bf1c3bcc21135c1d38dfe4c3ff593e18850dedfb314a90967815029a922471b
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious actions such as redirecting the user to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests that the document's primary purpose is to host a large number of links, likely to facilitate phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://sasolution.kr/userfiles/file/77226337488.pdf In PDF document text
    • https://vinaconexmec.vn/uploads/news_file/lusagisodegaxapuxuj.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/60839369894.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gakugavaguzitizus.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/96684140825.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/janoxuzemutidexar.pdfIn PDF document text
    • https://magerp.org/upload/files/65402107501.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ae7b26a039f44df867676bb07ff1c443/61749800784.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/89451275356.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/jivebilobowobiguge.pdfIn PDF document text
    • https://bagstyle.uz/images/file/gujadesitufan.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/tetaxugipubabor.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/32730331514.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/39808581637.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/seloluzavafidanipebutu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/mugupivowapeb.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/kotaketemowuxozazu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/kulibekiritovatimiwimufi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/14999714041.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/zusewewemifubeju.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/siliviwijukeko.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/bamojufunanit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=battle+io+gamesPDF 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_off0000ad00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD00 10300 bytes
SHA-256: 452fa8b42b5c9a5cbcbb3b86bb1b49589fad9cfb9440c71a1e987ebae5b506ee
font_01_sfnt_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 16588 bytes
SHA-256: 8c212fd41f5db0bb1085342be4133d7d5826611665c1a07d9b4e3295ca5d5b2d
font_02_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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