Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d39e91160b4ad39…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 17:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b47f1cd08fc489abc2d56629b01c4d3d SHA-1: 4814ee4ac7bf1125f554fa1161be449588b3aac3 SHA-256: 7d39e91160b4ad39d2bec862862d753e6f07d11c92054ec0af5cae5b25b9432c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs or the execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=call+of+courage+ww2+fps+action+game+mod+apk PDF link annotation
    • http://cuiquji.net/d/files/lowuzabifozekudetel.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/67758457625.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/12792674200.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/96170007425.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/37324688581.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/rudupikigimosidubawokexok.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gamobito.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/98863927041.pdfIn PDF document text
    • https://novsport.com/content/File/ponixegesuziviz.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vixuge.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/86574887449.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/zuwategixonijo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/zibufidewinofabore.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/75539361569.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/lezunofovet.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kewewajujitariferovogeboj.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/tetazopuwazel.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/rurus.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/60835802708.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/76201712732.pdfIn PDF document text
    • http://elpijisystem.com/file/dosibumojanolese.pdfIn PDF document text
    • http://zenkatsu.dk/files/wijer.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/65920538806.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kekax.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/16331639302.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_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 19080 bytes
SHA-256: 51def7055721df07afd157765affebc74f9af3b8c835c5c24b7470ebd6ae4dbd
font_01_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 11392 bytes
SHA-256: d84fe54111f317bdbb04e381c711dd104d694b4ff3e98bc9037092ba6d7fc977
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1