Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef566034ea65dba2…

MALICIOUS

PDF

188.9 KB Created: 2022-05-03 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 3fb49bb3d79f07c266e864504263ebe0 SHA-1: ca71f944dd0a7c0b459db0c93cacde422f33fbfc SHA-256: ef566034ea65dba27af73ad80184b5d1a20ff6b8dabdbad5b597fdf473baec3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding, strongly suggest a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9466

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://mifuj.co.za/XSRYdR1H?utm_term=manual+electroencefalograma+pdf++full+screen PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16205c48db0c89---75712696179.pdfIn PDF document text
    • https://dioss.eu/files/ckfiles/file/giremewasudu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1622db3eb3147b---11142355693.pdfIn PDF document text
    • https://stichting-pulse.nl/upload/files/99131830255.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/8996099.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/xonafavejalukaze.pdfIn PDF document text
    • https://sisparts.pl/zdjecia/fck/file/kifaliseregoruzeb.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/fesunasisuf_xebojuvotosazaj.pdfIn PDF document text
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/simofibimusasubak.pdfIn PDF document text
    • https://thedinosaurmuseum.com/userfiles/files/rukikogiv.pdfIn PDF document text
    • https://birotex.rs/images/files/wazawiladu.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/tivuxalimewigosobidoxodos.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/31176281886.pdfIn PDF document text
    • https://nesaxelevamuzaz.weebly.com/uploads/1/3/4/9/134901400/nimopusipepu-boguwomajadij.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/zatupivoman.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/jejebozedola.pdfIn PDF document text
    • http://www.icmtravel.net/assets/ckeditor/kcfinder/upload/files/93875540316.pdfIn PDF document text
    • https://nojufetabug.weebly.com/uploads/1/3/4/7/134748112/tesibarejevasin.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///40696461338.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/59683541785.pdfIn PDF document text
    • http://program-pro.ru/userfiles/files/94160544307.pdfIn PDF document text
    • http://muratdizayn.com/panel/kcfinder/upload/files/fivomiwagivek.pdfIn PDF document text
    • https://raxazejopife.weebly.com/uploads/1/3/5/3/135313527/8679576.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/26993698580.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/3254528.pdfIn PDF document text
    • https://87tunghia.com/upload/file/11070596500.pdfIn PDF document text
    • https://duabelas2gacor.com/contents/files/lomovibakemulazapesebofot.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/827781205.pdfIn PDF document text
    • https://companydemo.opusviewdev.com/app/webroot/js/image/files/tuvijojumuvisuratukotefap.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_off0002817c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2817C 19000 bytes
SHA-256: 8e4537036f6aefe85ec14ec02a6937fa1d1dfd6ef4956e03181b807479413ab7
font_01_sfnt_off0002b34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B34B 10964 bytes
SHA-256: 6ab0a7991c7b1f0966b17a9d4784ee74daf9627ff03d2b561ecb83ab8d8e2523
font_02_sfnt_off0002cc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1