Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae272a8afe9bc4cc…

MALICIOUS

PDF

93.5 KB Created: 2021-09-21 08:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e9de91df8a73483c80b2580dd197095 SHA-1: 7764f1796d5426527ba8892835dc67243c63ad5f SHA-256: ae272a8afe9bc4cc62aa5006e8d8a32198901618dfbbc68648e60dd76bf52692
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded JavaScript (T1059.007) indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions such as phishing or downloading additional payloads. The overall structure and content point towards a phishing or malware distribution attempt, commonly delivered via spearphishing attachments (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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=development+android+tutorial
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nopuwupulupaserefomudux.pdf
    • http://nikolalepojevic5.com/multimedia/file/55115812343.pdf
    • https://simpangkanan.com/contents/files/bovozopavupujuk.pdf
    • http://ingmontagna.com/userfiles/files/xafopobukopilavixejasov.pdf
    • http://pusheng168.com/uploadfiles/20210920235237.pdf
    • http://lamorenj.com/userfiles/files/tasinefasezifo.pdf
    • https://dancleland.com/img/upload/file/1677728781.pdf
    • http://kaithompson.com/userfiles/file/vimugakozavij.pdf
    • http://france-ex.com/images/blog/file/kisorawijit.pdf
    • http://okmarin.ru/userfiles/file/82435672061.pdf
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/ritakobiwuvojepif.pdf
    • http://prinsart.ro/uploads/files/vevirafejen.pdf
    • http://praguetransfer.com/files/file/10147142841.pdf
    • http://dominant.name/userfiles/file/pemejebuzozabajodo.pdf
    • https://balajihighfields.in/userfiles/file/21938889636.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/6429824384.pdf
    • http://elturo.ru/img/upload/files/10788882663.pdf
    • https://sergiomauri.com/images/file/25580738854.pdf
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/ruvukoko.pdf
    • https://brianhigbielaw.com/UserFiles/file/36214704732.pdf
    • https://fond.ru/userfiles/file/sufeg.pdf
    • http://synhbio.com/upload/files/23148078203.pdf
    • http://frutapac.com/ckfinder/userfiles/files/85858627181.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/lomozuv.pdf
    • https://kanat.com/upload/ckfinder/files/33884552307.pdf
    • https://galaxytraining.examinationonline.com/files/litavad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106be.bin
032c4d3a0fe325b0583446b7864a1760f1ecce80684b6af9779c3c1a828b6662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 10552 bytes
font_01_sfnt_off00011ebb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 16792 bytes
font_02_sfnt_off000136cd.bin
c626793c58c8bb0dea574107612d371485e320597f828adf4e4fe5f0b6b398dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 18996 bytes

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