Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd661f0f19eade01…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 22:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 235f70e541e5478797516fbe20e90423 SHA-1: 16f4aa4fb34e9cc1d82a636cf2fa95ac5c2349e9 SHA-256: fd661f0f19eade012c6142e6515cbf3db43101d47e1ed1f40549c176b6a48496
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external links, many pointing to potentially disposable domains, indicates a link farm or phishing lure designed to redirect users to malicious content or download further stages of malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://limeitec.com/upfiles/editor/files/13861695501.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vomuderegozajavunejata.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/63398380539.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/pominubesavutaw.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/72356550991.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/53943280625.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/80385766621.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wotixuworejijozaxumi.pdfIn PDF document text
    • https://ms01bet.net/contents/files/32799763360.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/13910703690.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210903043751.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361fe9ecc31---11798122934.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/wukikitala.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jexivufujuruwota.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/reniwiwokedubom.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/jikovetuvezepafugiguxof.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/sewasugofizawidivu.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/zamubumiwavusaxatopem.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/47008826148.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sotomisufizifojelivevunes.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/neruvubotiz.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918fb60ba0---23728697810.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/nemokanuxaji.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/4833658266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=godzilla+king+of+the+monsters+end+credit+scenePDF 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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 18636 bytes
SHA-256: 94faabae7feb21c0da9d1404dd265a367e3f8c140326491b0787ed4754a5ba18
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 11116 bytes
SHA-256: 5aaa4f50d97a6dfcc0fd504f4f2227b2c6f645b30b63e9d165f27762e62c8181