Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee62e1ab1f00827…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 23:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 416718d97e3f731e9cb6a246ad3dd738 SHA-1: 0ed529b64581645b07ae150a34664d08d9b77b56 SHA-256: 1ee62e1ab1f00827426f1286a9c8780cdaf81dee2d9bb6289d3d244a29972fc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://nomylo.ru/uplcv?utm_term=lte+tv+apk PDF link annotation
    • http://oletrans.sk/editor_uploads/files/neruwimigalivod.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/busagugadavariwezi.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kadux.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091600460273499.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/fowifagelo.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/82734294581.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/17668492191.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/83850358260.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/rebukavegobodixojudupa.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/wusora.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/41248645836.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/72020344704.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/27850620951.pdfIn PDF document text
    • http://skolky.info/foto/images/file/33470556665.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/rapikuvukesati.pdfIn PDF document text
    • http://jump360.co/upload/files/20210918122558.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8dec32f894c8bb5f1d8691313365f266/3222971337.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/85554705960.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/teleremuku.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe4abaa15---nowiborozebow.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jumewenobakuperofuzobizev.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_off0000c1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 16904 bytes
SHA-256: db1f4628f3835424653c8defa9c741afac8f77dc9f75acc78d76782c9bccbc9a
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 9728 bytes
SHA-256: 064a9642f963d32671978a67d5d413e466f3cf8c77fc2a80cc9eafb530401b1f

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