Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccc18a25e02be66…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 19:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2eb0e372e0720515ed21696ba299c28 SHA-1: d4a67ce149eb91ef34bfd411a4376c0bea2d2e84 SHA-256: dccc18a25e02be667a1dd4d2ec84ce8fca22eb4e932d56fec35f3efc4fe3f5df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely leading to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.tyrtaios.gr/ckfinder/userfiles/files/resoxik.pdf In PDF document text
    • http://prosquash.by/data/19699820654.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tasololimukaj.pdfIn PDF document text
    • http://domplus.su/userfiles/files/vesosawufigogaribo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d854cefe26---xabujurupoba.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/16781594411.pdfIn PDF document text
    • http://moneymaker-gold.de/files/52355473060.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/tunojumiwagaxadefipu.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/68388869187.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/tabopuzatujudetutijavinuv.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/texizugimegewosibag.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/vuzotop.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901161905933686.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/lavevowomerasivisareju.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/32971755955.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/mefoludizefutajuzep.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/birelutopogepepum.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/50975542985.pdfIn PDF document text
    • http://cichanski.com/Upload/file/30117472863.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/rosipizaxixolonolevolu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/83285289303.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/28331547750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+mobile+sizePDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10372 bytes
SHA-256: 2604e08a594458815d286861a53e19222e2dd93eb576b42bbc911380ab12bbe5
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 17176 bytes
SHA-256: 960c5bd361ad96ca60eca18ad53e0831fc79381dd15dc4f4cf32cc8549e90b41

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