Malicious PDF — malware analysis report

Static analysis result for SHA-256 7877a5f7f6c2419d…

MALICIOUS

PDF

82.7 KB Created: 2021-10-13 22:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 352dcb59b94ddbc2778e82326fbac8df SHA-1: 02c32052a4860dfd33d9ade1b3fcc4d3a79264e8 SHA-256: 7877a5f7f6c2419df378180d8e675e79aa365186b376192224089940e1cf836c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://abwingscolley.com/uploads/files/56852688975.pdf In PDF document text
    • https://numen-wow.com/userfiles/cloud/files/81430538174.pdfIn PDF document text
    • http://maxbrio.kr/files/files/15057568589.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/kufud.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/11641699431.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/sutasalux.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/75940114731.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161535069ea23d---77566826064.pdfIn PDF document text
    • http://divelife.kz/files/file/bobidarowifi.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/54361851837.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20211011170147.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/76092587368.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/matuweriwu.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/megopekamivadipezefi.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mijugoxunesiworafa.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fujinop.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/nowajabezev.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/wejiwixek.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/talajegosoxujusanewevet.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xiwerifaxiraruvapilunu.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/laditemizeneza.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/74149604180.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/govezapuwomubagavisazatez.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/sitiwewot.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/jerufuvupigaserigeriko.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/kotetalun.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/duwubikakabogudepo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=beginner%27s+guide+to+digital+painting+in+procreate+pdfPDF 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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10980 bytes
SHA-256: ef4ecde65c8970351258eed742a9e15b8c6d3b6572859350b9562b525cc81a7e
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 19464 bytes
SHA-256: 692d800398c0755e5f15c4aa3f7c2156bf941551a6fa7d3a5e497a7ecca032e7