Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b27d1d5b642930…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 07:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d35af03cd781cc9a8ca5e584bf5037b7 SHA-1: 3af729ebc9a14f54b1b2d213f0224747406ccd6e SHA-256: 91b27d1d5b64293076cac3af6dc0b81b1e28a6b57bda509485c6dd42463f6b4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially malicious or disposable domains, suggesting an attempt to redirect users to harmful content. While no scripts were explicitly extracted, the PDF structure and external links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=material+design+tablayout PDF link annotation
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/dozodolupodigaxilid.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/45939777038.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/vejuzik.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/86769721782.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/romubifagakibediz.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/40229527938.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56615747394.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/53622006202.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/21164590162.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/76156835.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fb867tna60q9uqei2abdr4ug86/71124352396.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/52269052149.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/2147858587.pdfIn PDF document text
    • https://stormester.no/files/file/24490692842.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/96193518967.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ce3949a57577c6a430ca7dd50861bc27/tuweposime.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/38144220047.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/77741859240.pdfIn PDF document text
    • https://fptica.ru/images/file/bulebozefadawovovus.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/18336282649.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/5588390401.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/90972822747.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/lutatisebizumunux.pdfIn PDF document text
    • http://chayka-svg.ru/files/romutenunedevebutojixit.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/fafuruvedovaraxedibob.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/73387700636.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091122443583.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_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 17800 bytes
SHA-256: df4c4bee0addf0e13bb7108ff4c59fc7f5d130fcbc361cf176f66d18e465afbf
font_01_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 10768 bytes
SHA-256: 2bf7cf45f43c236666212640e5fd55b2932ed02a029297fabde506c8c47dad66
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1