Malicious PDF — malware analysis report

Static analysis result for SHA-256 9330876988560041…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 04:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6ab0ceffb36e3db741c0e9a958bcb84 SHA-1: 57f63bdab095a3c87295879aae5f9c018ec2ff03 SHA-256: 9330876988560041cc7e5b0f209d32aa0bac9e8d9b05e8c4d48c904446a45240
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect the user. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=tft+teamfight+tactics+apk PDF link annotation
    • http://quinta.cl/upload/files/bedarosaza.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/9447598385.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cab70911---bimukema.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nixozigiroz.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/32495191787.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/17167376967.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/24704198351.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/livenu.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/48144150803.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210922_66A70E79B64BDC44.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/moramoxamafibapokivu.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/59004778372.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/32648731268.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/25733983203.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/wuxadorigixevabizuseki.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zagexumegubebere.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/83194577468.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/88322346065.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/mazijobujemudasigitaxolax.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/4597287437.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/fugos.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/katisovizabupaze.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/ponivuxivofunizimosubujok.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/38596526190.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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73E 15464 bytes
SHA-256: c8f4f56d6a9a1167889441fc8aea436aaa564e359e2680aa1dafedae7314b0e3
font_02_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 10612 bytes
SHA-256: 6c518381a31727f4c1bc11e52b1940525b9537b87c0c722f07cc528be525dd48