Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a94e8b3e6636d8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 16:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adc34688154ee2ff0fb6fe7a1033fa95 SHA-1: 1d2949a995da3c9bd74ecf4d7702dc12c5b79c2d SHA-256: f6a94e8b3e6636d8f8fd4ed00f16f2de7a5983623ed29e18055d7dd2f00b4388
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=how+to+make+a+potato+gun PDF link annotation
    • http://patrickstaxi.fr/userfiles/file/59296437900.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/59628316669.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/veboxuvo.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/leponotuwusotapeleluser.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/82289604962.pdfIn PDF document text
    • https://polaria.cz/images/file/zutupofuzawasurebiloku.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7284d432c---kupolubogimu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/86475422628.pdfIn PDF document text
    • http://atek-ent.com/upload/file/98072282210.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zebanumewotimuvilolob.pdfIn PDF document text
    • http://alcantara.cz/data/file/4125653466.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/pibogewepopolozirabozodeg.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wirofev.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/82907873720.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/paguzafixisoxabobezugaku.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nirisobumowi.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/navudanog.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109110102363119.pdfIn PDF document text
    • http://stylekd.ru/files/saviwezidusavonap.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/66637209838.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/21329965455.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f0e517af5e716e4d8f9332b531526d10/pawefamagafapukijos.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/90106252358.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/finesupevavejexeralo.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/pagasewasamum.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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 10460 bytes
SHA-256: cff1aa14c2e2fb69e652ea1d99895f9f7e2be289b3aa946214cafdf246488d46
font_01_sfnt_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 15548 bytes
SHA-256: b986c5a117b252ddcdfab30e55b80902a658a1a72849ef022fabb587ea99a35d