Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a512e32073e802f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 06:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a955ef6415da7c23d40a8077fbbdd61 SHA-1: b92ac65a3187dece7db2c622bf76f7f14600e64b SHA-256: 2a512e32073e802f52c4c6ce1971428f2bfe1e2c986210a45791bc004c2286cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The presence of embedded JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.detskaoptika.cz/ckfinder/userfiles/files/49931657619.pdf In PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/dajorowakemaxe.pdfIn PDF document text
    • http://electric-kernbichler.at/53727953120.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eee0f3e2b5470c84788488ace152d055/mijibefuwejusumemaju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136722b4c238---99740679797.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/62264231125.pdfIn PDF document text
    • https://manenshop.com/upload/files/dinuluturagazedirazumaje.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamusiguwetazuzowesured.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/gapekutose.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/fadigovupe.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/61465841154.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/29876141124.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/4812082456.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/mosevutetedapibop.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/51361222686.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikuwaboburitolarekor.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/vuwigakotixoli.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-3/20210903085522351219.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/62936204952.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/54456140930.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/25036460154.pdfIn PDF document text
    • https://network-italia.com/file/94858736352.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/86945513351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wps+office+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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 18500 bytes
SHA-256: 09a001def27aed12d15d9ae30c00c1d5a6f722c8fd435e304b5d3ba249116834
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 10464 bytes
SHA-256: ee3b5532a2d5cadd978ba2d06efd5392ffb788ac78c503752d574610458f728f
font_02_sfnt_off00013ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1