Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f2bafb2f1eb6c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12e33943480a054517e9eda93bb363bc SHA-1: cb58fadf096dae4ad36b558a1affe88972e090a3 SHA-256: 437f2bafb2f1eb6cada9d097575c380030030353b42b08d9d761ef6b3ae6b0f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and configured with UTM parameters, strongly suggests a phishing or link-farming campaign. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ydtmuhendislik.com/ckfinder/userfiles/files/zuranorediludidololi.pdf In PDF document text
    • http://canadanur.com/resimler/files/9480994044.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/61330485296.pdfIn PDF document text
    • http://prestopc.it/upload/file/80721571688.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/50295673199.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/lamibubujurofolabewagudim.pdfIn PDF document text
    • http://renknh.com/ckupload/files/64036330085.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/89676706365.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/zozaguxevonamavukupe.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913220150.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/56754200524.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/jaratologadolav.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/wemiterixawuzove.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/48547968509.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/21797506442.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/19854713606.pdfIn PDF document text
    • http://tatooazh.ru/files/files/75313393488.pdfIn PDF document text
    • https://digireg.lu/upload/97129236173.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/44889050619.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xidubikeze.pdfIn PDF document text
    • http://standardamulet.com/files/files/57226469905.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147089d22715---77228946441.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcd221de3---20586153381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=macos+support+essentials+11+pdfPDF 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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 15396 bytes
SHA-256: e152e990d50852bb8017acde87533465764e7fc06e767ddf8f9c1f2fc6b2c577
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 10760 bytes
SHA-256: 8b65fc87e69a992f4b112eaeef3398257bf7dc836722269aa4a18a7191a38e44

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