Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec60958e86e169…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 03:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e0f9d34b854058f73dc97d877e452022 SHA-1: bee5da2049334e900c861afd45d7ca1f79b15418 SHA-256: cbec60958e86e169d14fe159920e7da389eee2e852b7ee4e4edf744042553750
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic in phishing and scam operations. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=banana+fish+manga+pdf PDF link annotation
    • https://maths-pdf.fr/ckfinder/userfiles/files/figusofosugos.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/33658258954.pdfIn PDF document text
    • http://checopharma.com/upload/files/kavafudolegazuteteja.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/forarapisufefebexokoxupud.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/20104802942.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tunularitawefujosi.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/31490669077.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/mesukazizurofogef.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/678255843.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210913file///xesukilosuxovaga.pdfIn PDF document text
    • http://abpaluso.com/upload/file/82009529439.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/leladiluk.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/21298142719.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/pepurowogonumipeliru.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/6953860416.pdfIn PDF document text
    • http://automag.pl/userfiles/file/pewaretowagixipaxa.pdfIn PDF document text
    • https://obchodsezlatem.cz/upload/files/536910970.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90601624204.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/rudorokirofopa.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/3648382047.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/pevot.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/89510a27b82019b8d1117e5f8513a7ae/79553743464.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/fawitogelokimajinad.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/52601447241.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b7cb742f00ad8c420bdcca347e89571a/92134959398.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/95340927231.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_off0000b437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB437 16976 bytes
SHA-256: c7594cac6eda5c1f1a36f128c3e0ecf88e5b3726c7b05553396497a73ebfef75
font_01_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10500 bytes
SHA-256: 0b2cf3ab1ab1aa839b5ae45e8085b5c434b4e3d439a56670341d761eabf6684f
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1