Malicious PDF — malware analysis report

Static analysis result for SHA-256 262492b856a66025…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 03:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4044821706d436463d2276ac58a652dd SHA-1: 6169d0cc2565bc19ac6d064f35aec56242524ad7 SHA-256: 262492b856a6602566ae7fe75a02f1aa9314aa8042a9faab39bbe5f2bc104ea3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, including one identified as a link farm on disposable hosting, further suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://amuseonline.com/absite/userfiles/file/43845097610.pdf In PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/jixinovizovekawutema.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/vufejanuj.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mofaxanegafaremusa.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/55290142211.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/44263634793.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/dajafodutiwisijularovuko.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4054404788e86b5809cd9d0707fb4696/78744783438.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/85456658655.pdfIn PDF document text
    • http://kim-clark.ru/files/file/mepafu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/oalahr8b5u9c499p9qk5emm4a4/77408936868.pdfIn PDF document text
    • https://aildf.in/userfiles/file/51372341185.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/63884114657.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/75702655174.pdfIn PDF document text
    • http://dfzh.jmdftour.com/fckeditor/userimages/file/88950683658.pdfIn PDF document text
    • http://badgerhillfarm.uk/67441388775.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/75479508510.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/romofok.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/kepik.pdfIn PDF document text
    • http://intertravel.hu/_user/file/17407466221.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/35787115913.pdfIn PDF document text
    • https://shunnasato.com/34232345562.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/9256477690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+slideshow+settingsPDF 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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 10432 bytes
SHA-256: dd8edaf18a2816ae12555ded6162a42980ffcf01316c55f1127efd347b39f4c8
font_01_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 15504 bytes
SHA-256: 63cee5c767ff767a14b39838fdb0bc88ff09760e4d043aca1e42238c55eacc8d

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