Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cba39731fc4f9a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 06:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cf3578a2858e68ddef6465c458638be SHA-1: afdff1506f09f0f877bbba9fd70755928a9fbefb SHA-256: 02cba39731fc4f9a12e0534869d0ef9df6396b1ea825c39d62af96da31615781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links suggests the PDF's purpose is to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://studioschicchi.eu/userfiles/files/wazolunezulemuwi.pdf In PDF document text
    • http://sowiik.pl/userfiles/file/moluritipalobun.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/lajixaluzerewora.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fanuvumizekonobusonox.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/03utverludqlb5bp75ldcmrcf6/19070610168.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/27729458828.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/38312534444.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_081211.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/navavonixikeditimugaba.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/45558985020.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/69049355195.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/81080067151.pdfIn PDF document text
    • https://emenu.hu/editor_up/gokuva.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/81952483572.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/gadugosilux.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081848375575.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/35797437609.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/jupafevijanivotep.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/78982446512.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/famapivotopiminixuvi.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/1876235918.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/83005034414.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/varufuzegamibob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mikrotik+android+appPDF 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_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10124 bytes
SHA-256: f23e1ee874aaf34ea5990bddc8693b63670e69aab193b00510728a4349e9a16e
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 19304 bytes
SHA-256: d3ab24fac81b7094ecadfc7dbe735c4f07081a92fc37c91434f79eb71c85cd94

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