Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccba4c5f58aca6eb…

MALICIOUS

PDF

90.7 KB Created: 2021-09-08 17:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 638c2bc90b7bb2e9d2e5a4fb427cf371 SHA-1: 97d8f1e4ae4b03544d83b68ebe06a1edfd6a6489 SHA-256: ccba4c5f58aca6eb8e7733bf1473bb0883ba98f356f9897aef03f1836c894ed5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://airholic.com/UpFiles/WebEditorFiles/file/nawun.pdf In PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/taditejekafefotamivewodar.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/15495313948.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210905180319.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090115540236.pdfIn PDF document text
    • https://susta.vn/userfiles/file/21191684467.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tuwenanumasagi.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/goluforovujebukawivu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4i7v4majdkfrum01nfdvi9br6p/vuruw.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/wetotasineli.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zufinanenebo.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/68983055674.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/mosonimodibulogiturolezu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/mukavuzajozumejadere.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a421e0e1c3c7e27663ed7fde5683d6ee/zamumawebumut.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210905190902_1165324639.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/xasifadip.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/josurerudotowaku.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/mivirirewanovubu.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/99258981739.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/62416457775.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/tazudujelepelojuziremup.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/padegoxijagusoguxetu.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/lajebozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=html+tags+list+pdf+downloadPDF 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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16428 bytes
SHA-256: 309f9cfd90b3891ab8351156d035e95c3b8e2d4ad7540270cdfc1ca3b4fb304c
font_01_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 15852 bytes
SHA-256: 75b9dcad1ede684f8638c7ed0a70bd649ffab2599014e72e39d7e3ac120e1f52
font_02_sfnt_off00014518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1