Malicious PDF — malware analysis report

Static analysis result for SHA-256 7591393e432d95d6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 15:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d00b326e8c749ec4cab2cfb31f41a238 SHA-1: 46b2203df519961ca59b2481d314d182923e4e29 SHA-256: 7591393e432d95d6548ca702f3aa386b9b977a91c1384c9e74bcbaf3b3c8a571
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are characteristic of a link farm designed to redirect users to potentially harmful sites. No scripts were extracted, but the overall pattern points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=dizziness+and+numbness+in+legs PDF link annotation
    • http://mylodge-naoshima.com/80225805908.pdfIn PDF document text
    • http://apismorava.eu/docs/10031357592.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/30894298446.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df25481263---rofipu.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/fevivoz.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/newimavotuxezar.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/nadewowirofakuzad.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/50818369336.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/93251153249.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/73795276369.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/zenobozodafejumuw.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/vinimofeporogiv.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/puzolugamivuwot.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/3516101346.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/1020058041.pdfIn PDF document text
    • http://heizler.hu/files/file/9214771333.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/24866531041.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/33388624828.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/rejukidalidin.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/jipotazewa.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/48566325422.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/46750947144.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/xarosezogepan.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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 17372 bytes
SHA-256: b7d6f6038e3a4f5fe045857a7472ff038a11026b885ecaafaad48e2ea853ed00
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 10572 bytes
SHA-256: 0dccc58c8a9c9b8f8670bf7c2cc10f30b3ae46bbf75854b205f15d44b216bea0