Malicious PDF — malware analysis report

Static analysis result for SHA-256 e590d3602edecf24…

MALICIOUS

PDF

88.9 KB Created: 2021-09-18 20:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7c5b4610b4cc0a6e100eac8440602faf SHA-1: 180ab4159393514fee77387ffb211865f178e775 SHA-256: e590d3602edecf240e1c969a630fa4a52c2c6b9659c551a65b28e691fdbeb227
162 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the phishing or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://pistant.ru/uplcv?utm_term=logic+and+computer+design+fundamentals+5th+edition+solutions PDF link annotation
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_7B22ED429F2F9E0A.pdfIn PDF document text
    • https://renault-service.com/userfiles/levekemaf.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/59707697105.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/75356765886.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e07a6a6ec---7077181943.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/seritefukat.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/sogolevi.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fozav.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/79047626626.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/pawazarabujazomigenoferu.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/58628700973.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/tiwisuxixumugusujoxez.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/9391017310.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/71473372294.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75560310567.pdfIn PDF document text
    • http://dytac.hk/userfiles/vapetajigafa.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/42913473484.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gagegofizobojevezotuvi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/53416286250.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/lonakadumobimasag.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/zirujekevav.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071026198103.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/wivisipa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32a3adf97---19376274277.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/50554542126.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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 19604 bytes
SHA-256: 32d2ceb2c76bc69843cd829b68a1254da059795cbb53cf26b6d54dd4dbe281a1
font_01_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 11256 bytes
SHA-256: 84b406628b4f72458292170998b8d52c41e80e88a1ac82d089bcc44a4daf1e5b

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