Malicious PDF — malware analysis report

Static analysis result for SHA-256 93955758626fab95…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 21:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08c8c52b3a70826a4678a3b4abf3dc95 SHA-1: 545c554f604c7f9d776b4f37875b4c27f9bab3c7 SHA-256: 93955758626fab95638a0fc570f0af83d6f8a42f5460d66ae4ad1ed6d2a7c17f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=as+a+teacher+how+will+you+respond+to+the+needs+of+your+diverse+learners PDF link annotation
    • http://cnwt.mgo.cool/upfile/files/2021/09/02/48246285055.pdfIn PDF document text
    • http://boldogelet.hu/media/koxitikiwexudeve.pdfIn PDF document text
    • https://pecsikult.hu/files/file/27324913404.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139293069b---14611939993.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/lamazi.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/30697091416.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/40694628896.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210902212446753510s071g.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38075636978.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/65010580134.pdfIn PDF document text
    • http://sushi-belovo.ru/files/93321239571.pdfIn PDF document text
    • https://cmoretv.com/userfiles/6318167007.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/posem.pdfIn PDF document text
    • http://vtaky.sk/media/file/gopur.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/mikolan.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63616736158.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/61238340313.pdfIn PDF document text
    • https://ksboutlet.com/file/files/88545740609.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/5871703460.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/eee74e513ae6e88ad71962b1cca6a4b1/5634163617.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/75760024422.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/loralujabafumufafi.pdfIn PDF document text
    • http://soles2walk.cz/data/file/logivaka.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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 17476 bytes
SHA-256: a708b7b697a88e7d3f541d261bc1883150dffc9c04f90249bd0ba88ef0abc77f
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 11064 bytes
SHA-256: d330ca9a0086d7e8a2aba9093c2fe2c76f42e2f85986456777c5ea60d2f9c753

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