Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f46d79dbdd3466…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 20:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cacd07e222001e203c9a74bb3995d92d SHA-1: 46173437bb929757495e9eccf5ccbc75b5d449cb SHA-256: a0f46d79dbdd346636449f2811b28ec86adefdc933090897c0435bf3ec1436ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/xuripevemixitobudebumedaz.pdf In PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zusurefe.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/61747602020.pdfIn PDF document text
    • http://annabarons.com/files/files/19224872469.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/nakisam.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/56849850213.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kelomiwiromidoxes.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/mikapi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/bimif.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_095429.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/53176252346.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/36448465983.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/33240946801.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2406f92ot7kq1b1okbmjqa6gp7/65132722691.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc9bf2f2f---komozufekinevenefib.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/93875037173.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/56481086952.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/widurop.pdfIn PDF document text
    • http://spharma.ua/files/file/ketix.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0940ac6bbdfe3af7727dacd773877c11/sewagesakuwenuj.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/wasiwiruzabagotujaf.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/67036983338.pdfIn PDF document text
    • http://teakdeck.pl/files/file/fifupudovo.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/18779688188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+cancel+advertising+on+my+phonePDF 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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 11216 bytes
SHA-256: 3ca9988eb1b45cf204403fa54136ca4943053098bdb8a831abc2e5117e12ba56
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 17492 bytes
SHA-256: 7b6501ce7f1f7db461a239236895ead9eb7885a70a77d3c7a61de9649b0f7080
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1