Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c046ad7e4860d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 00:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c0b5ae28dcfec1a6f249a27af4b8792 SHA-1: a843dc7c421dabfffa175bd73d69bf329233d985 SHA-256: 4a8c046ad7e4860d4ede0473719bf84984e79d7f395c002c2fa6e8d2642197ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, including being image-only with a click-outward action. It contains embedded JavaScript, which is often used to redirect users to malicious sites or initiate downloads. The presence of numerous external URIs, many hosted on disposable domains, further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614789050cb86---18617446134.pdf In PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99104855778.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/94340598751.pdfIn PDF document text
    • http://gameadvisers.com/js/new/fckeditor/userfiles/file/dojivomi.pdfIn PDF document text
    • http://standardamulet.com/files/files/28378748297.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/73800766492.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/21609524539.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/13026857537.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/74074450093.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/96637942039.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/51246204805.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ve80qkpdjmsa4baopi5c96do2/sezume.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/26804575154.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/38917741613.pdfIn PDF document text
    • https://hobbypet.cz/files/file/79849716133.pdfIn PDF document text
    • https://invest.pl/userfiles/file/48663718924.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/zisinexej.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/32042377914.pdfIn PDF document text
    • https://mytopics.it/uploads/file/64058607906.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/pafitelomelupotabetowu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/8938492695.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/fokelolipubegewisit.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/96425378474.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/vuzitobakedavipowepo.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/71110624173.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/97666474266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+hero+sea+apkPDF 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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 14116 bytes
SHA-256: 9de9879215bf31409992d0188eaa679e381f42ccc6bd83007744aa45ea7c3b18
font_01_sfnt_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 10208 bytes
SHA-256: b498347c88be56654ec7335fa1171a33f89d4f22b773da40a3e022b55bc9e57d
font_02_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1