Malicious PDF — malware analysis report

Static analysis result for SHA-256 1743c4443ebe2156…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 05:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 19f5b854420427d5ade6cc9052a0a09b SHA-1: 3b66d92d6d2430a4ffee67ef41f921027da85430 SHA-256: 1743c4443ebe21569c51d1ef02d1ae35f874bf94a947a7257046e619f6224fbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It contains a large number of external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nakakinpump.kr/fckeditor/upload/file/9208939069.pdf In PDF document text
    • http://stamforgtechnologies.com/uploads/98779498728.pdfIn PDF document text
    • http://medrea.ru/upload/files/79313748862.pdfIn PDF document text
    • http://cecev.com/stockages/files/23920657460.pdfIn PDF document text
    • http://xycrusher.com/d/files/88742790305.pdfIn PDF document text
    • https://remini.hu/userfiles/file/73769129644.pdfIn PDF document text
    • http://ridendo.cz/files/file/79404649555.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/563650621.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/lobivumawedu.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/92440288355.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/31987526670.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/53333233908.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/minowofipupumu.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/88415972664.pdfIn PDF document text
    • http://1careglobal.com/upload/files/funudukamelul.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lefewajomufiditadimaraw.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/34423646618.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7c740aae140102c0466c1e73442f5982/18667945448.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/fegina.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/15814550743.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/fevunimavizakinabiruketur.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/degatake.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/rexevuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=simcity+apk+unlimited+moneyPDF 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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10788 bytes
SHA-256: 42a7c1a46a5020a357dd4fad5816892cfd3c059876eaf7dad24015afef9121ca
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 16944 bytes
SHA-256: edda540b44c46efa7cfd08dbae7dd67ee788348c31a55e43f957051f567e98bf

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