Malicious PDF — malware analysis report

Static analysis result for SHA-256 311690d0356b1232…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 19:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec91a237d14578ed58e451eb6857374f SHA-1: 20dbf3e0a111603659486bbe23c21ddd2f28aea2 SHA-256: 311690d0356b123240f4e21fa991d5054b6594f54772223cae81b2c4ef39247a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, often used for SEO manipulation or to obscure malicious destinations. The presence of external URIs and the ML classification strongly suggest this PDF is intended to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=pocket+girlfriend+android PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16148a86c01d76---pixap.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/87949944572.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/66605115972.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/40668994185.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pobepuvibuzafotuvojolu.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/20280788339.pdfIn PDF document text
    • http://electric-kernbichler.at/25338007443.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/sujekib.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wufemuvukanabubuputa.pdfIn PDF document text
    • https://interconformity.ro/images/file/97189980879.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109140406182760.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/57062590465.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/gunuzofujivubegama.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c78994d875be1e776d4e8f5f1a7fcec1/30538685620.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/wejebipide.pdfIn PDF document text
    • http://apex-architect.ru/images/file/74847923497.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/kikajasojog.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/rapipewapofor.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eefcda334863d93e5c9e62145b4156e5/85035820901.pdfIn PDF document text
    • https://cncunse.com/d/files/tovapozafemolapilebugaxi.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_7D075DA4D9877569.pdfIn PDF document text
    • http://timebymtm.com/upload/files/gotijukixu.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_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 10576 bytes
SHA-256: 78a1ef37ceb0671b829e41a8c4508e35c7f9f383b4f0d95d63ffe56979b86091
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 17556 bytes
SHA-256: 1c3de25437dbe1857b3b1d1000ca1e92da480d4a26110c1c88aaa8ea447cffb9
font_02_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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