Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bb8e3b45cd3299…

MALICIOUS

PDF

92.5 KB Created: 2021-09-17 01:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfb77241330c2486b3acb573b60f5b51 SHA-1: c3dd3b11e9dee86891aed997e59bf0cdda015a69 SHA-256: 49bb8e3b45cd3299c7c715a0ec3c0e1b77041c30b7b366ec47c2cb598df6c0f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://virtrade.gr/userfiles_lybo/file/fajogenanumati.pdf In PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/mezipiguranepe.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/vakezasutubelenuwake.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/piloxolo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/54648471279.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/82739948663.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/48305657439.pdfIn PDF document text
    • http://inphilong.com/upload/files/noxelusifovijajegeseke.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/magamoxojenisixoju.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/43694620469.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jumosorapa.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/diwurosujewedazuwil.pdfIn PDF document text
    • http://regmac.net/userfiles/files/wizenug.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/tidewilab.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/93356987735.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/jitubewawegakarobikima.pdfIn PDF document text
    • https://interconformity.ro/images/file/10704906651.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xepewifubejuja.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/dewusomavuxas.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060718238988.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wolirubomonemevomum.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/wawaturabomosanav.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/kexozidepesopiwi.pdfIn PDF document text
    • http://kgmda.com/upload/files/18271540648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+coding+software+for+androidPDF 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_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10744 bytes
SHA-256: 62c1084cf9311b250fa2035a790bae0e0093cd46037a6c4dd622cabba97e8d3c
font_01_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 18068 bytes
SHA-256: 92529b0d402c83d0a7052029c7e3cd351245c170ed114ba935a4d241ff7ce914

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