Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c5a5aea1dd5804…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 04:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ceb7be41661608a72e56bfcaa7be4bf SHA-1: 197c59d84f903a812a3c43215385c48bf7912d79 SHA-256: 86c5a5aea1dd58041ceb87a00b5b60c18c43c329578d5f799744bac87153df4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://best-of-geldanlagen.de/userfiles/file/tokukidajekatog.pdf In PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/zidegekisibabexe.pdfIn PDF document text
    • https://atlantidegattico.it/file/midavuriz.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/kasoza.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/wuluzujufux.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/nowemepijen.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/poxavapasanatusama.pdfIn PDF document text
    • https://777mto.com/contents/files/jugigubewabawozotijozile.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/62426057961.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/xarowekale.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/fifur.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/24123595812.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/kelagemaje.pdfIn PDF document text
    • http://dezis.ru/uploads/files/56768832127.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/rixumaponujidi.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/29326386286.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xoxenenezeravuv.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/33846489850.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/womozononabixoroj.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/voruzujexedevasadejuxi.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/raxinopizijawewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hacking+apk+for+android+without+rootPDF 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_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 18436 bytes
SHA-256: 39a48c8ec881741b8403924b25423216e59c98c5527dfbf3802215d4afe58a4c
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10824 bytes
SHA-256: c75a631f7e755788fcaf649d046c0779ee05be415c75a439fa763606eb41e673

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