Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b88280148f3bbeb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 02:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b5179558f9c6406e2c499913398bf9a SHA-1: d7efca80325725aebaa357d11699b1a36db1cdd6 SHA-256: 0b88280148f3bbeba09de3451990bd068589e61aef6c6f8d44caafd2ed058f91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a lure for downloading a game mod. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for numerous links, suggesting a malicious intent to distribute unwanted or harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=naruto+storm+4+mod+apk+download PDF link annotation
    • http://betheaskssd.com/flash/betheaskssd.com/file/25825657945.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/11550628251.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/39162128745.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/kuwuzofokisex.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sidiniwibobomisem.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/73930115082.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafumemeleg.pdfIn PDF document text
    • http://swhos.com/upload/files/xemupivosolefux.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/fimawagoluxokupituza.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/xujavu.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/momekidojiba.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a18066e9---74641081261.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/70064222029.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2d4b53db6918f588667faab2f698339b/wopofakebi.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/wizaso.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/74054829473.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/7042953252.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/44920303874.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/44918297922.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/kisujinogugokik.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/58401095189.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/wetesidumedopuguxes.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/mewodo.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rozibejosukadumatoba.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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 17316 bytes
SHA-256: 728a04a4033aeb5902fdcbdf9ec849f96f1cf6e21fbdc29af0d9cc4fdd5c7a41
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10660 bytes
SHA-256: 76cbb27b132dafe0b398ca65da8a0bd51f08410da74ef3001d18cdbef9a184c5
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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