Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9b17027058c783…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 21:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4388b286f2d80c9333e37869fa226cc3 SHA-1: 23785277e1bea63ac2c00a61102115e55b8e65c0 SHA-256: 6d9b17027058c7836870048cd4bfb35265ef0894c3398d98256600c8ee8002cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to potentially malicious or phishing sites. The PDF structure and embedded links suggest a phishing lure, likely intended to redirect users to credential harvesting pages or download further malware. No scripts were extracted, but the presence of multiple external links indicates a strong intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=hungry+shark+evolution+cheat+codes PDF link annotation
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/9140538455.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/tofapep.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/JBSVds4anrf5.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/63376087394.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/53865499026.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/2732009951.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/kazimaxijopugumaw.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/woluvakugidewawuwaborob.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/neredofalakarutobipakepo.pdfIn PDF document text
    • http://indikino.com/ckfinder/userfiles/files/nikad.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/jomikis.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/ropuwokokivijeburilix.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8af0667a---94645991121.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/40107128656.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/widabokunexevajopumef.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/68837720324.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/tobawujume.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/35184545249.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jubisibubotunabexodoxav.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/mafikidunutufovet.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210914173007.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/62301493785.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71f187da8---66792130565.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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 18128 bytes
SHA-256: ccd49ceb2a30ce495046f8f71c8e10d08714a19fe86310325a494a4df4fd781b
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 11012 bytes
SHA-256: 60f1e0810b5ffca3ee7f015bad21ccc8f06b1c665ef3a18ca10e456520b2008e