Malicious PDF — malware analysis report

Static analysis result for SHA-256 500c38626fffe933…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 02:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b68c450f7fec7e050bdce86829ce2a91 SHA-1: 8329894df8a4ce8157419ba14bf8ac48faff8df5 SHA-256: 500c38626fffe933c45f3b331ea8543a18f67331ad1c146a3f439c004c865f9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs that function as a link farm, with one URL specifically mentioning 'minecraft pocket edition game free download', suggesting a lure for users seeking game downloads. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=minecraft+pocket+edition+game+free+download PDF link annotation
    • http://scro.ru/pic/file/wobiv.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/jobanuwimeber.pdfIn PDF document text
    • https://techlan.pl/files/file/vegizarinikoxigo.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/8051580140.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133953cdcf76---71719709811.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/puwebiru.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914033239.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/retozexuvegebozajilun.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/43257383555.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/219400198613b18ba450be.pdfIn PDF document text
    • http://www.moyekolodin.com/files/66356995239.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111418085527.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/52652672826.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/lovusafakirowakov.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zesiroxijomi.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/jajofujoxufekiwiwelaluk.pdfIn PDF document text
    • https://unaizahic.com/Files/files/likunodedadamajavelelol.pdfIn PDF document text
    • http://nprofit.hk/userfiles/5202328101.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1329ae0744f02d7bc3ea5005a6f0c4e7/lefowuxi.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/94472576768.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/xabijopedurar.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/33511691124.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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 18668 bytes
SHA-256: 8e42a2fad0f92923c172c9ed2bfb31d089e8c13c4cbe7a8a4fd8b43eca72d058
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 10964 bytes
SHA-256: 60dc9376fc1e56037a18fffa09b153698f897eeaf7e663bbecbb9207b70a043b

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