Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5593ac2e461d151…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 03:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87b793d2d0caab39d397ce15471a35dc SHA-1: ac0a126a0137fc942598e96b1a2ef63772cd9fb4 SHA-256: e5593ac2e461d151ead4e21968696da89f6c2d0e1f184de9d406ca649c3f7076
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites, one of which is `https://oniceh.ru/uplcv?utm_term=my+heroes+academia+heroes+rising`. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded scripts or exploits. The presence of multiple external links and the high ML score support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=my+heroes+academia+heroes+rising PDF link annotation
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/45157967137.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m9gl23lpo3mciduea4imlu0sqs/36229317972.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xuzarujebobidizisepuwo.pdfIn PDF document text
    • http://chemicalengineers.ie/images/92592561053.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14147779853.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/lumomikozizumamo.pdfIn PDF document text
    • http://forti.in/userfiles/file/8696073161.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nokena.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/36769520997.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jejiburusamimamo.pdfIn PDF document text
    • https://qkon.ca/images/file/bopisawuxobo.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210914101423.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xirojaxopu.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/8349071312.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/21242167321.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/48132963334.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/felul.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/kuguratavujamanafumo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/pafamino.pdfIn PDF document text
    • http://synowka.pl/galeria/file/45236923542.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/37093736672.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gizuwedorobijemifuse.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 10780 bytes
SHA-256: adeb9e69c0355fad949e449fa954db1af0e459f2318c20958a431374d19cc0ab
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 21460 bytes
SHA-256: ec481474d758c6b138e2f148b9b8d8b81526b573e71ba0296db084847c7ad3fc
font_02_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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