Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc88852ecc59e98…

MALICIOUS

PDF

68.9 KB Created: 2021-09-14 08:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dcb8934b22a121dd31db7a352b0bcd8 SHA-1: 350d4383f4d73917fc731b2bb9de2d688664c782 SHA-256: 0fc88852ecc59e989fedbac97e63a5fe46a4a726b4c5cb69782cbe58b9fe9315
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to other PDF files hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing activities. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://mkbeauty.vn/luutru/files/virosedururem.pdf In PDF document text
    • http://nfc-lampang.com/user_img/files/nejirupo.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dinesiroxubevo.pdfIn PDF document text
    • https://sanidom.pl/img/file/16925313201.pdfIn PDF document text
    • http://whatdwellswithin.com/file/61975708374.pdfIn PDF document text
    • http://emeat.ru/var/files/94347149983.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/50748451561.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/17328994744.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/88522179420.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/17977688122.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b6b8d1aaf279f9d414e6a3aedd28bb7d/29204932240.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87f8b519f---zilamafi.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/belenexobowamex.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/84961525822.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/zurozebazepotuzakopuw.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/sosuvukiwaremux.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_F5C5255107721E40.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/57283598773.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/20847664731.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/febesemafax.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/tutesev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=badlands+game+download+for+androidPDF 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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 14976 bytes
SHA-256: d9145c3a54e13b3fc7f213f5dd67ab3fd1c47628dc50e43a0cf7eace3c21f224
font_02_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 10740 bytes
SHA-256: d51bffc3e6c20ac3c98cd91585b42cb9b70de07ea5732e0b1eb7f2464d684b81

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