Malicious PDF — malware analysis report

Static analysis result for SHA-256 247dcca3463783da…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 06:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4808a1784911379014727f19100a4997 SHA-1: b592c0873a6fbf4ad8255ce35238ec77bdea524b SHA-256: 247dcca3463783dab4d82ce3e9ad557fb59d9ebe51c648e57e3584ecacac8d69
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains a high density of embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://casadko.fr/userfiles/file/nodozigomodura.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/dixexuwomujanaxuvux.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/pakadipiwaravexukapano.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/3731802646.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/27327623953.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/momaferojugovovokojito.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/31326152388.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/kolumevijalanid.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/ridufesekipusufuz.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/samibifapasafebivisal.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gejuw.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/kizodumorunidat.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/gusirivirububoduzupovot.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/82675939908.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/27204039813.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3ee348e6d68556ebd91d1221834fc326/vozawonalulog.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/18129878623.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb90b9924---kozexujoxobuxudefemo.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/29553453539.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/rotezutigezenap.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/71412157829.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/35926598912.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/41022425496.pdfIn PDF document text
    • http://retailcop.ca/files/60700626448.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/45818469654.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905110506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ace+browser+apkPDF 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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 10324 bytes
SHA-256: c7218e0b46c598c524b457f4dc73a5907fff4a668265fb6fed972b612232def7
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 18824 bytes
SHA-256: 263ebd7192797a979f18df4580e22eb6e61df4dd6804d0b3d12d0637fbc5ef23
font_02_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1