Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62778cd8980e29b…

MALICIOUS

PDF

89.2 KB Created: 2021-09-12 23:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88ab47ccd618eb5d43b5ab7e09b43fa5 SHA-1: 1ec62aa53b60f836771521267389b72b03cc655a SHA-256: a62778cd8980e29bb144181b2eb5317b3096f037088c1755f3e529aeb413ab12
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=more+apps+like+cinema+hd PDF link annotation
    • http://aprt1day.ru/file/49773025986.pdfIn PDF document text
    • http://esangsok.com/upfile/files/92653158298.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tobugimexavatekutopakodu.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/33644281715.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/masuburi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6475cce7a---kowagofomofufo.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/65461532549.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/rarilewojikowakigisebanon.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/51234051445.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/51343518934.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/2772287408.pdfIn PDF document text
    • https://dcimx.com/files/10137726354.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/tamigupo.pdfIn PDF document text
    • http://candientushinko.com/images/file/zegunojowixe.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/87a62557c7838e3041e70544e333ae92/xijej.pdfIn PDF document text
    • https://hiroyoung.com/data/files/66385923901.pdfIn PDF document text
    • https://ottopianos.nl/files/tojevovivid.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/88073513948.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109071835208466.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/guvunud.pdfIn PDF document text
    • https://goodline.by/userfiles/file/89752363954.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jufedojukozuraped.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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 16668 bytes
SHA-256: a38b5d902d46536ecce11611a9532e3a32c25c60c0e1727b73f861a8aa322155
font_01_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0F 10764 bytes
SHA-256: 0cf4afb92395b82654aeef7bcc24b60649df41d05bc42c37ad7088645bf230e8

Open this report in the interactive analyzer, or submit your own file for analysis.