Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c4ac61e2e0185c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-25 03:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b46ec1824e46e5d50edbfe33acf55a3 SHA-1: b8d3736d15f23b693b72f43e242bcace6900b4fd SHA-256: b5c4ac61e2e0185cf7060462e7e1eb7225f268a0e8087d24998fb473b36ae899
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=backup+reset+my+phone PDF link annotation
    • http://ruresept.ru/files/file/18755356647.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/51023299310.pdfIn PDF document text
    • http://k1a.ru/images/files/file/73576940051.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/50022400058.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/fonifumuni.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/lamubadewevino.pdfIn PDF document text
    • https://kildevangen.dk/files/zekem.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/bajetikotenasikejorofuxet.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/zobozeloxisubuf.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jikisavorurarodogus.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133456b6bf2e---6107380449.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109090128535615.pdfIn PDF document text
    • http://metallpress.info/files/ruvikapemakibaf.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wisinekibe.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/vebugezovilifab.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/68972786172.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/9718719673.pdfIn PDF document text
    • http://cmtsport.com/pliki/60509349506.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/25216708536.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/47099179821.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/vewilakeboretekapekezasof.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/turapezipapabav.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/nanokilepegevamurifelalap.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/41914915741.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_off0000c672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC672 10860 bytes
SHA-256: 44c76b15db71c1ac9ba52035e31f2028e5e8e418b9aee9c9d6762d5d59f6df99
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 20448 bytes
SHA-256: 6f95684d340502668c02cee0dcbb7b77a908428ae7a8e548cf3f23b5b9e30662
font_02_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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