Malicious PDF — malware analysis report

Static analysis result for SHA-256 519073fd431e5b05…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 09:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec15682a08f73f060b10cdf13a8ad4fe SHA-1: 650203a3c87447f7477d1269bc9b1584b5cf5025 SHA-256: 519073fd431e5b0502120d70c7042506e86fcf62627c25ce095c84288ebdbc8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=neoragex+5.2+a+download PDF link annotation
    • http://jumpstart.mobi/ckfinder/userfiles/files/texemasupenoxuf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a867712c1d---giwup.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/magokigalelo.pdfIn PDF document text
    • https://hssanesteban.cl/files/88750499682.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/79046196280.pdfIn PDF document text
    • http://bandwidth.aryanpalace.com/userfiles/file/vimasi.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210919_191219.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vironasotapovitoxa.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xofabetagabivosuved.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/59171669297.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/33347837379.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/37188761178.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/2994345373.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/xutazomekirutijifogekuzup.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wiwixu.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wobavirurojo.pdfIn PDF document text
    • https://mar3ol.com/Files/files/vudemewopozupizidub.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1oet49pcii44ctreqpd15drrt1/93903604135.pdfIn PDF document text
    • http://schokobrunnen.com/idata/vutezaladeru.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tagaraximejewipamidazuji.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/89570064485.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/zumemapokarewaguwosoxasex.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/13546667318.pdfIn PDF document text
    • http://xtra360.net/campannas/file/mopikanepokeriwexikilaf.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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10552 bytes
SHA-256: 5c6d88f16a8e47abb23f41316b79a8dede437ba770ef4252f27c205d21c2ecb8
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 18168 bytes
SHA-256: eee5a06ba49452f357b8e4ef284e0ce9f686296f6927ec1241eeb9e7bd03de02

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