Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2855b8e6b9f61c0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 22:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2e71191d9928ad7ce08c1360922f5f6 SHA-1: 1f67d8d21f530abf2f103685010b71d58452c407 SHA-256: e2855b8e6b9f61c072a75bf581f887de40d82d4fd7d8a714acf5510a863cf652
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 hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=how+to+go+back+to+previous+update+on+android PDF link annotation
    • http://verzorgingsindex.nl/images/uploads/gadujexavad.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/97c503aa54a3909ec32fae0544012fb3/lanotajizerolarimer.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/57409760038.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/87892459485.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/16366899171.pdfIn PDF document text
    • http://alcantara.cz/data/file/rixijujegofuxokotepar.pdfIn PDF document text
    • http://freestyler.cz/img/file/98422155072.pdfIn PDF document text
    • https://kildevangen.dk/files/61942422149.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/92280394977.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/69435811608.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/doragowid.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/91676209140.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/wepivujubabanazi.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210905183400.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/mamijitudikaxevefevi.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210912073336.pdfIn PDF document text
    • http://qdjshg.com/files/file/75865624379.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/41890587532.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zetub.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kosimejivomujor.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/21260067973.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/77894753560.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161367831c369e---jotegodeturubexevero.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pipujazerevazozal.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 17900 bytes
SHA-256: 826f6020ce05461fc330454351922a3570d6f6fef3336665e7f591cb31e2c298
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 11120 bytes
SHA-256: 776f2e3d69e631ba18aa634b62cc9a4749aaf64f98e414aa7263a7ad16e6297a
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1