Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce5ec8cd8f1de50…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 12:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd7b24d94f1a58db9b235a37cc82e7e2 SHA-1: 48fc2974656c3617f3676a213f8ee388126045c2 SHA-256: 2ce5ec8cd8f1de50c47a45e3c575791f669ce7a5389ce5d896888b990b37b116
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://eamenfaraz.com/cache/fck_files/file/sepusegefobabupomegebe.pdf In PDF document text
    • http://milwaukee.center/userfiles/file/doluxaliwiserujo.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/dakipupukimekizir.pdfIn PDF document text
    • http://recviem.ru/img/upload/47849045570.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/13921527453.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/gurarivotuxapifa.pdfIn PDF document text
    • http://pvvc.cz/files/16217821067.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/16722248766.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/voxogomadalutejaxame.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/gefogugogixakido.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/nomive.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mixoj.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/fedutizuxiledi.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/74610593886.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/21806160553.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/sajokefeku.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15368673076.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/zixesetubijokafijaz.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/84470205269.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61861924441.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/28113315647.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/35174193505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=legged+robots+that+balance+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 10904 bytes
SHA-256: 2251c775f783db7b913c22f86c1cf3a1738468870873c1137ca2376b217f8e96
font_03_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 18172 bytes
SHA-256: 4bea7c5820e1957c8848d9925ed285baf13fbd0d6f1fed5946261f2597f97bc1

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