Malicious PDF — malware analysis report

Static analysis result for SHA-256 b222e91ffb752895…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 08:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f4f1de3e72ef1add5980c5f3c47b9fb SHA-1: 4678699b8b9bb85b5803e0e84722870da57a7afc SHA-256: b222e91ffb752895cd530f217360a1f8323277d52a6f7c2911372b1ac2a4a6f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm designed for redirection, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=pop+up+tab+blocker+chrome PDF link annotation
    • https://peintures-descours.fr/fichier/files/wanofav.pdfIn PDF document text
    • https://paperland.bg/uploads/file/3945386117.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/57940900199.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jaxiga.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/98796341665.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/sitig.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/taruwaliz.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/bunexuvodimidu.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/refapetatoze.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/boguluzewuminonu.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210902053457.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/pateposuwudazow.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7acc49736---53201423791.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/71678845822.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/20219202020347449.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/36770028041.pdfIn PDF document text
    • https://norservis.cz/files/files/11934588154.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d746728b8---getasuxupafejidefajuti.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/bixunejedela.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/busugasutamudomigi.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/80042841161.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/sixij.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tisadujerifulanenab.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_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 16876 bytes
SHA-256: 9b29a14e43125ccefef8ef350aebd2aad33e75d24882bd1181e46ad334c61cb2
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 10608 bytes
SHA-256: 202848b83ef30e0a55516789867c8476a92e2fd6028378b9679cf013358004a5

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