Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b894e9d4492548…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 04:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc05e55421d107bccf62ba1e5987b69f SHA-1: 3fbc873f2b2d3f4dc896d3cec6aa893313c7503d SHA-256: a0b894e9d4492548eec416a9b170c29ef5bc70484dfd96a425b3715d62b0e294
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, indicating a high likelihood of phishing or malware distribution. No scripts were extracted, but the sheer volume of external links and the ML classifier's strong positive prediction support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://weddingdove.tw/uploads/files/202109050923186112.pdf In PDF document text
    • http://captaincook.hu/userfiles/file/93203677265.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/vorobekujelaroramumovo.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/19488591269.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/66581492276.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191222418080.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/kogosotekemokutotesaturo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/nololigudini.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/15610347486.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351edc1ac7d---15901563155.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/vupamatamekidasoputiv.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/44131508554.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/xebojinudumemudosula.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xejepemep.pdfIn PDF document text
    • http://rld-carbon.com/file/gukidikefexoderajuji.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/68323588183.pdfIn PDF document text
    • http://industra.sk/userfiles/file/degawiso.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/88285525245.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xaxunisorogorowugavof.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/wapajegebapijop.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/sipojexufawat.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/xunew.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb90b7b9f3---65419627644.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/65078388420.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/xesutezasisolovego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=piano+game+classic+challenge+music+song+mod+apkPDF 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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 10956 bytes
SHA-256: 21c2d542c46cd704e34d13d8948d738b5f06e417bbf806da63add6cfb2daeb68
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 18920 bytes
SHA-256: 5b1d1fcaaac2c4c3c7c3efdcf4d7d1c96511a0741995c8c5dc229bd6b3cee768