Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ffe41c2db76ead…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 10:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2f1573a19b9bb1425c37457706f3565d SHA-1: 5b4907a5a4482fab7077668ccd04c0cfbef1fb85 SHA-256: 36ffe41c2db76eaddd3257893bb7487c06995b44c73c6df986785b5be3e84cd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=principles+of+economics+8th+edition+pdf PDF link annotation
    • http://ugrctrani.it/userfiles/files/danobejifebesaxovu.pdfIn PDF document text
    • http://wenxuezj.com/images/File/futisuzes.pdfIn PDF document text
    • http://abwrva.com/uploads/files/tojujirupivagavepelos.pdfIn PDF document text
    • http://oris-am.com/editor_up/gunidopezifiweketavo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/bufozabatodixemunel.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/56422117153.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/4215661339.pdfIn PDF document text
    • http://land89.com/ckupload/files/52025972370.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/fikepupopuwu.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/25971067558.pdfIn PDF document text
    • https://brakos.it/file/bifemekuwi.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/fepirelonatedejaxarixupor.pdfIn PDF document text
    • https://melz-feu.ru/upload/pinexomenobananukoxesovug.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/jiwar.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/buxesikunumumorodunit.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/susikaze.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/51750690747.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/boxuxomurexiseti.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/7759472844.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/94176997478.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/71013013091.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/58196333168.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kalatoxigipopabe.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/73727246700.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-3/20210903011754365529.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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 17152 bytes
SHA-256: 72336efd0e57f9b87dbe54e7fc5f379f2dabfabbe964adc2ea0ce895fe546363
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10932 bytes
SHA-256: cb6c599287544e144711edf429c7d4b68652afc5484ca9e076c68acd6c1e576e

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