Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421eb927d3b6fb3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 05:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2bf3f9780dee3acafa9d10087c4dd535 SHA-1: 5cdc7f698dd36912afc003d5caa68af757de279c SHA-256: d421eb927d3b6fb3498269bdf7e31242949d1f06d34dc82ffbb47165ef1429cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were extracted, many pointing to disposable hosting and acting as link farms, indicating a likely phishing or malware distribution attempt. The document body was unreadable, but the heuristic firings strongly suggest the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=bleach+vs+naruto+anime+mugen+apk+download PDF link annotation
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/moruvekusonosabipid.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/balokopafefezojiva.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/49081257989.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/dasavijurowisadinuf.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/20068183484.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137668771f9a---33446492671.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/24936999014.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/562590d2230f22fbf26e6184f0128a61/ragob.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/vapofasabifux.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/81183454734.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/dafebowatavuv.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/80235849863.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/puvisebelonakulivija.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/valudu.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/67500291611.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/rosumitumuguxalewu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/20620659888.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/sotuneburir.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/samamozadogokodasulel.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/lafenetesevelimetuvezi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/70qir4f0kvbsjca7qb1akfra8r/31614981173.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/xupinisav.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/jedalitazuxevitovedago.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_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 11360 bytes
SHA-256: 80411f1676235cfbb581fc50a33440e8af5f997ee5663ee73db8f7471027c11e
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 19888 bytes
SHA-256: 2aa16f02b3e1dcffdb5e2b9154e88d3422478a07163c82e86405e4f238cfa9dc