Malicious PDF — malware analysis report

Static analysis result for SHA-256 963f989ebdc87925…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 11:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81764be0bf3efd952bf4157089a53fe1 SHA-1: 75d1b5636000c16016d0362e825167ec65e6b3ab SHA-256: 963f989ebdc8792525b3ad3ad1c4737af0f3d55667585f7925acfa4eaa381eb9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • 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=convert+mp4+to+mp3+iphone
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614607c2b1b60---kusamitizi.pdf
    • http://marasintl.com/public/ckfinderuploads/files/zibipawutulune.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/58779423195.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/didarul.pdf
    • http://c-six.it/userfiles/files/22689253062.pdf
    • https://serka.com/serka/upload/files/47212453260.pdf
    • http://innotec-industrie.be/userfiles/file/magomisifaxidepamotipaf.pdf
    • http://lesen-und-schenken.de/userfiles/files/fenejamomawinubabag.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/26199566269.pdf
    • https://mtestbd.com/assets/uploads/files/14565426820.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b6c056b553d895a797f7b42d7d85d3fc/90955634724.pdf
    • http://vitalchurchesinstitute.com/files/file/58405183664.pdf
    • https://braveathlete.net/geektic/files/6944124777.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/19210633872.pdf
    • http://hzxgdz.com/images/upload/File/88795553287.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/6500600148.pdf
    • https://1000families.eu/userfiles/file/zegolorufula.pdf
    • https://1000families.eu/userfiles/file/pewuxomele.pdf
    • https://soenen-pneus.com/upload/file/91711110636.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/89907856803.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109131404596475.pdf
    • https://gonguyenkhoi.vn/upload/files/datetotefuvov.pdf
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/rosemovefetegulezepofol.pdf
    • http://testplanet.nl/uploads/files/noseguxa.pdf
    • http://chukguwang.com/files/fckeditor/file/4771078216.pdf
    • https://bushregenerators.net/userfiles/files/45093348758.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd6.bin
c5165faff0aa7764ddae860f42822b5ea8c3cc1f89b451a8edfa8e8bc568f33a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 18012 bytes
font_01_sfnt_off00010aa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 16792 bytes
font_02_sfnt_off000122bf.bin
70b0146ffbd2256ecc7aee002e7e9e6ea5d3cf01eebadc2c3853f1c461fe646b
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 10488 bytes