Malicious PDF — malware analysis report

Static analysis result for SHA-256 eedb97b5493dc40e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 03:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6f1aea09ade111f95ab87e93c548c4ca SHA-1: b88391952ef9e183255b17d54a2365efab4b8242 SHA-256: eedb97b5493dc40e6cb1690babd2018727c75eef55f41d04661237877475c369
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, one of which is presented as a search result for 'a whole new world piano sheet pdf easy', suggesting a lure to disguise malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=a+whole+new+world+piano+sheet+pdf+easy PDF link annotation
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11454049624.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/wezusak.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fapatapibifumomu.pdfIn PDF document text
    • http://zerosquareonline.com/file/goroluwunakata.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/55441853594.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/bejak.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/zobilasexo.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/tolelimebowino.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/10502989466.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/68648554364.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/83469276461.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dovabevazitezogil.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/temafafobesuf.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2f7e048a---menexuwenodifidazajeza.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogotonepasox.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/14294547330.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/65654199632.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/94047503266.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/nukipadunakisibinagi.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/kavepajetugimowopuxizoni.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4f2d69bc9920fd632d25e0904ae32192/loragone.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/86881001331.pdfIn PDF document text
    • http://jaqalsports.com/files/file/68482873098.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebepux.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/lisosek.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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 10776 bytes
SHA-256: dbdee6c6e28473908a08273cd7f4da091e49de90da4d8112858266dcc6117981
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 18464 bytes
SHA-256: 287c998390dfd9f26b87de3bc82232a34f3081936e7a747105bec5d824420d62
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1