Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a054043b281bf3b…

MALICIOUS

PDF

81.7 KB Created: 2021-10-05 22:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9268e910f538d91d01eb82ccdd573e2d SHA-1: d7e3b40500bb5868018bc1796c2bef909ac4a336 SHA-256: 1a054043b281bf3b48cb321bd96081d77083164edefb9c74eddda8be2568fcfe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF document exhibits characteristics of a phishing lure, specifically designed to harvest credentials by requesting MFA confirmation. The presence of numerous external links, many pointing to disposable domains, further supports this assessment. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving JavaScript execution within the PDF to facilitate the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://tehnicgaz.eu/files/file/lamupumiwimumesunedevoju.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b47ce24f64b2c7407b8ebfa86982f84d/zotewelatariremexugoramam.pdfIn PDF document text
    • http://alcantara.cz/data/file/sizubemobuxafufedo.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/22063922214.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/lijan.pdfIn PDF document text
    • http://cochemical.com/upload/files/joriwevaju.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusifumikus.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/90830933288.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jafulexofijuxanexulaxopu.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/36098195871.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631108746_6b717a480c.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/19718278204.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/83639468807.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/9612742375.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/tijajuzogugekaz.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/67691829329.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/buvosozu.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908143542.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138121ddebe9---20037574160.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/vopinijexudada.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/pikuxipaxawu.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/rewepomigasefivuro.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/54891252188.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gewogebax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=i+want+to+see+my+family+my+wife+and+child+waiting+for+mePDF 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 17708 bytes
SHA-256: ac3d00ec9300fb0c98e22c604c0f7456caeb4b78fd2892ac8db57bb8e38b1199
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 11076 bytes
SHA-256: 2b8bdcacf7874db3f2681f93c6f4fa30646312892d13edd88168595b38abcd09