Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5750798c29601c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 07:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da4ede82f20503e55e435a4b68440ecc SHA-1: 7aabb6ed6a33c608e8505b84c6a6089fd4a67bcd SHA-256: 9f5750798c29601cda2f56272640aae03ee866670a22bd299fea1e450f5f383d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=short+comic+stories+with+pictures+pdf PDF link annotation
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/57152204639.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/dekile.pdfIn PDF document text
    • https://mimpidia.com/contents/files/lonaxivimarajogi.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/30113850677.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/224981876.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/29914796169.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/nakuxekufowevugusujinil.pdfIn PDF document text
    • https://paradigma.bg/uf/file/18637475985.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/xizetoxugubitetowesa.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/9366312885.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/50010681354.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/goxofereforifala.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://salonorganica.ru/upload/files/86385679213.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/56965961972.pdfIn PDF document text
    • http://evola.it/userfiles/files/vepesi.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/dufonogurobolimanove.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/07173029750.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/43924731403.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0b11cac0---48033291525.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/mesovedupanaragemaz.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348758a82ea---jaxigafis.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/motewogelutuwi.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/50897662543.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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 10832 bytes
SHA-256: 90e315fb501095ed2f14fce8ff0f066dedfe047e9d742843b10e73219a251a12
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 17872 bytes
SHA-256: 527452909e11d85d44af92ff3f42506fec87cec659545456210d4210f59e24c2
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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