Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a37ecbeb212587c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee7003c9bf88a3efd97a46e09ca722a5 SHA-1: c9b911481092dc3a4f0f30217d474d8aa5c5ecf3 SHA-256: 7a37ecbeb212587ce4c9c71f79c4916c38eb5b4656a9cc42c2fb090721ac0afa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for embedded JavaScript. This JavaScript likely facilitates the redirection to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The presence of numerous external links, many on disposable hosting, suggests a phishing or link-farming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gazetavk.ru/img/file/kovejetiwad.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2f32f2de---38109788067.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/36118317602.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/99102747836.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/fomike.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/luzokojirugevinit.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/94098504593.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/xonimuwuxonaxa.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/55099777240.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/27048984786.pdfIn PDF document text
    • http://gespk.com/userfiles/file/70312781401.pdfIn PDF document text
    • https://ijp2.com/contents/files/navadizisujobazad.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/84146562599.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/tazagipaje.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/wawujamalev.pdfIn PDF document text
    • https://mytopics.it/uploads/file/51809275969.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161331274b74e3---jimajolojopazitifuz.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/10642702659.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/wepologopupunu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/65919280205.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/65524403747.pdfIn PDF document text
    • http://vitrine-prof.com/files/88417298863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+put+android+in+pairing+modePDF link annotation
    • https://lapdonline.org/file/jekupanolexar.pdfIn PDF document text
    • 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 17448 bytes
SHA-256: badc1c0f69ee1d48c65c5c8d452e8aa5533f889ca32b8b92e0809a0e7c606a84
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 10700 bytes
SHA-256: 723e72c462fb11f1e55efd5305b69b4ab7f0beff914b10e048ca0f130243cf80

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