Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7536856b42c96bf…

MALICIOUS

PDF

112.6 KB Created: 2021-09-08 15:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9caf3b549b42f7f6a6551edf35060108 SHA-1: fce7b7b45dea32c2be7b68b794ef91a344ead348 SHA-256: f7536856b42c96bfefa32769ef71d7fada2e19653833fe1ecde588807b4e4339
126 Risk Score

Malware Insights

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

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. The PDF's structure and the presence of many external links suggest it's designed to redirect users to a network of sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://yunnanyingxiang.com/ckfinder/userfiles/files/lukesuzejuzilapipusigul.pdf In PDF document text
    • https://girl0229960192.com/upload/users/files/jipaxugagumaxawetulu.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuruwus.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090416442322.pdfIn PDF document text
    • http://princeverma.in/uploads/files/31204184353.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/46249807674.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/lelowib.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xaresivafufig.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109080357226110.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/33218863086.pdfIn PDF document text
    • https://atavio.ru/files/file/410915532.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/ruzidimaguxozolen.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/merogir.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/78647105092.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/6173864476.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/sixizoduvizo.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/29952181618.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/10807124217.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/nazivoredulin.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/8215125040.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/5823757467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=geothermal+energy+applications+pdfPDF 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_off00014c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7F 20416 bytes
SHA-256: 0f2ac78eebc3aa9062ba92305d261c8f53965605477983e7fbd2c47be14dd143
font_01_sfnt_off00018232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A49 11220 bytes
SHA-256: 6eb11c443132111dd2481818adc7201591c190e18ef536ebc70718e76f762fd8

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