Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d723ab046a0abf…

MALICIOUS

PDF

89.9 KB Created: 2021-09-24 10:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53523c9562947562d82011147960b5bf SHA-1: bad6bf237a6d84e494f0d14c8b09151beca78693 SHA-256: c7d723ab046a0abf6009779169372eeb9ad8a4db84fa88f12104abc83fe77a0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. The authoring application 'wkhtmltopdf' is often used to generate PDFs from web content, which can be abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=3d+design+apps+for+ipad PDF link annotation
    • https://anukulagrotech.com/ci/userfiles/files/pifutedofupa.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/92855566138.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/2680034932.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/juwepimusovitagozomupaw.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/bekeloweka.pdfIn PDF document text
    • https://777mto.com/contents/files/diwunexamadesukakegupi.pdfIn PDF document text
    • http://honda-vo.com/upload/file/90902604833.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/90511371067.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa324397d---85032784998.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/suravarusovukizudulukarip.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/21780386503.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/133b65fe53347bbec9349c4f9ce4c611/27907873468.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/bewagekuwezito.pdfIn PDF document text
    • http://schubert-hh.de/image/file/waxowufuvozavegisixegite.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/35510852624.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/93162600787.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/99233045504.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/lisasosawopumukatel.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/36048075225.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210920142611.pdfIn PDF document text
    • http://popmetre.com/news/files/zidopo.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/64812602531.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/mesuzasedixore.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_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 18464 bytes
SHA-256: ad20cebe594457fbd323c641521d8510502abf25016a5ffac9ceea39e6513b0f
font_01_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 10604 bytes
SHA-256: 698f86a9078fce6faa50344daf2007b8017220dab3147a633aa15a3efa59e1b8

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