Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4dde468e0f8ce…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 13:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3049a438687931a4be82fb1482b0cc8d SHA-1: 5cee2c69b9bd01ed6672bffd78a8ad8bb0e00553 SHA-256: 7ad4dde468e0f8ceb384cdcb57775b5e82fc9967d7794eed79b21a6d5290448d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which point to disposable domains and are likely part of a link farm designed to obscure the ultimate destination, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gipowusepeparuzosa.pdf In PDF document text
    • http://steelfurniturecn.com/d/files/sugunazelidukodibog.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/78609217114.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/55632300092.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/74923665608.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/befejujozobevilibatexuw.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/48393565870.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/4622377963.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vavulumidonetopapa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161347410707ff---tofewewokupadi.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/61150609581.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/duxetuniboguxafabadefix.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zefilopevasijozabedorep.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/90816927640.pdfIn PDF document text
    • http://fullx.net/files/miwunilezamivewebirizuvi.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/26394831412.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tivetiripesuvorodorabawe.pdfIn PDF document text
    • http://carszana.com/image/upload/File/56885445244.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/11499914541.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/sezikurobubo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c4852dd0cf66ace286a5df84b0cbc85e/65790549406.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090606432854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=play+store+app+advertisingPDF 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 10748 bytes
SHA-256: 9cd20d317cb49d9e9d5e4944df4583ace90be8ce19cd49ce51de978f26775869
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 17504 bytes
SHA-256: e8f09b9900d0d77dcb0f02a825642f6c0ae09d9f3ff40fe86d845e64e9d4c32e
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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