Malicious PDF — malware analysis report

Static analysis result for SHA-256 31de328930ea3893…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 01:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3de4b56df70477aa2bace9bf958c3bbd SHA-1: abbc8414778d7dc14920fa8d39fb79983dcddc54 SHA-256: 31de328930ea38937ab2162d235b62a0c8b476042d90dc2a9d4490653d9c30c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://pixomot.ru/uplcv?utm_term=mathematical+statistics+and+data+analysis+3rd+edition+pdf PDF link annotation
    • https://keongracun.org/contents/files/7505966120.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/19830389749.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/94510381505.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/jevakasafotu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/40292197141.pdfIn PDF document text
    • http://test-immo.com/file/78780964054.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rewupimowezomoxolawepop.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/aac7c259cb55285bf6095639b6b0fd6b/4393078067.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/newiweperubozilirev.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/80640348895.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/77324641819.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fevuza.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/waseratirimurijorekef.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908105809.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/95528216502.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/33923277643.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/98920075908.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/pigatam.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/35676713375.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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 17848 bytes
SHA-256: 991964e3bb869ee6f5717a53bbf816bc3d168c81445848bc7adcc12ad846f3d2
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 11164 bytes
SHA-256: def6c694a3d1854bda6f855e94974a6553a11e93abd89f62893d4aeca2f903ae

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