Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4428873c55cf83…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 18:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5abf227ae4e2bfb6faaa4ea7f4b7b92 SHA-1: 09ce1787402849a7421decb991bd5786b3ac33e9 SHA-256: df4428873c55cf8385d3649c887e9a9b7c2b73ac654775c28330f00d2bd818d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect users to external sites for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://elsped.hu/files/file/goganurewo.pdf In PDF document text
    • http://watthaistuttgart.de/userfiles/file/36294792260.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/41981296981.pdfIn PDF document text
    • http://djapm.com/userfiles/file/tixivijizekogokewavumube.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911954286794.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/11821623414.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-15/20210915220956572742.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/savelasipepipuwezexuvakaj.pdfIn PDF document text
    • http://slsnn.ru/content/file/bubam.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/sanamajekonozuraniri.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534f0ba54f---bogowikevog.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/zifureluxesebemefizu.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/55905636155.pdfIn PDF document text
    • http://it-hair.com/userfiles/xabemaluwojuvemegibofix.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/27312369634.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/bokumukimaxamukidupoboz.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210916060825.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/29649762399.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/xerenowutusilobuta.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/92458571994.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/98603889811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=express+js+book+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_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 14556 bytes
SHA-256: c2a4b1ee63a98607f9cdb7bd4cf7868006c8dbaba4b4991c625926b3b2332740
font_02_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 10436 bytes
SHA-256: 1548357601bf1b0a105be7e25cb1e537e1d248c06f65f48ab04bd279ce1bde8a

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