Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3f7b13a519400a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 03:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c773bc4453b2f00d7f5bc2ca352e164a SHA-1: b87550b1681c3c7673e2a3d0a0b91264f25a8565 SHA-256: 9a3f7b13a519400a618d273fc418b89e0a8f0d4e502f77d6c0d506f3c6980dc8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URLs, many hosted on potentially disposable domains, suggests a link farm or phishing lure designed to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eletvital.hu/uploads/files/mapuvajorademiginusopot.pdf In PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/80651606486.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/33727857288.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/cf0feb878928e1eb7105d0128228f21d/zasuditibopi.pdfIn PDF document text
    • http://myarchitect.es/ckfinder/userfiles/files/ranogupedozoforuti.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/movipusasejarinitimufen.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/jaxatebofube.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/riluruzijupam.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/lizaje.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/63123126547.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/30221579751.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a64a3e0a0---98057937012.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/pafazosuxisuragobabipoxi.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/jipobej.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/guwelomanomumeburo.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1143944872614202f4e8668.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/pawobiwumedi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/kawalugekaxabuk.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/72297798005.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/64021134548.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/82217996546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=photos+to+sd+card+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_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 18604 bytes
SHA-256: 4be20669059a66eb37cdfe77ee6367cccbe905ef9fc9abd3025842726fd47796
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 10288 bytes
SHA-256: 976920bcf29019cfb9a62cd9706dd73c818a7eab58c5ec4bfed134e4ba76ed21