Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb96427d4bf5b986…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 18:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 365132cb9baaaa4bf252501419983e47 SHA-1: f7780c792a95ec79c67de79eb91651ee37cf1724 SHA-256: eb96427d4bf5b986f57181935864e4910b3554b93ca472062ef37a283c2311e5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent to trick users into believing they need a password to access an archive, a common tactic for evading security scans. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=cara+extract+file+rar+di+hp PDF link annotation
    • https://khoahoc.timviec365.com/picturesfiles/suwetezup.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/11891298642.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jegibupenidabikutodabo.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/41215441679.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/naxowe.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fuzenazogovirazoj.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/23399947844.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cbbaa629f---jozimixibifotefijij.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/92969675928.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/medumures.pdfIn PDF document text
    • http://hoachattn.com/image/files/81764969874.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kanexutijosigato.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fa05ada9---37476593244.pdfIn PDF document text
    • http://bndweb.nl/upload/files/56464821181.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/74107572887.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/togobun.pdfIn PDF document text
    • http://scpt.it/userfiles/files/65807560019.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/laxovekirujopisomidi.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sizibiwu.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/79508019377.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/gozeruburesewobikosogivor.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/40469459814.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/42334235722.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/vamupozadejolavex.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 17272 bytes
SHA-256: b5abc7863678d743919e1dc7a899eb73deca612e313e2e054d3f9fc8e1663b23
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 10456 bytes
SHA-256: c83219e262f725cedecf09186cf4d1369cacfd0614aa3ed6eb4861228d2c771f