Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c712aeed0eda25…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 17:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66332b83aa37651834bb8e4310a7b703 SHA-1: 05f7061b155b3ced4975286ed8a930a468feea77 SHA-256: 97c712aeed0eda25e1c85aed7bcf3565ddf1865cf159dcd5c6a7a9a48e059092
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phish for credentials. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://luijkzonwering.nl/image/file/2682720103.pdf In PDF document text
    • https://kildevangen.dk/files/46988349710.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/41655040118.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/tuzuteras.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/wurugefu.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/timepixetotujevufitoga.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dowejolidisurozaretaki.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/runoroneduzujuwo.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109090924006584.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/41461746200.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/gupuromeveguduvagoduzuvum.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/tajiv.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/filituvu.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/17328701077.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109101304522201760wirx.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/litanipomupobiza.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630456334.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55054911066.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144090e933c6---fajozabawula.pdfIn PDF document text
    • https://bataretak.com/img/files/file/64985158325.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/vijafagakadoz.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/97603119177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=unprotect+the+pdfPDF link annotation
    • 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_off0000ad39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD39 10256 bytes
SHA-256: 890c7909abe9e549c6978e57c353698bf4515568a1e55920ad9c4514f204da8e
font_01_sfnt_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 16516 bytes
SHA-256: 441a7c731632b15deab8fec316302b6fa86b7b6fa6d6d3ba6b11041a29ddaeb6
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1