Malicious PDF — malware analysis report

Static analysis result for SHA-256 9631520d90ff347f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 17:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff82bcc58f71a12bf2e09f4c788b3da1 SHA-1: bef0bdf876124a031d87faf24ca08ba04e94298b SHA-256: 9631520d90ff347f38e900dba9be105498bc3876721d85e572fb8b34ec12ac4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to external PDFs, suggesting a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content through a network of disposable domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sapthagireesyathra.com/userfiles/file/wilizug.pdf In PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/80057911623.pdfIn PDF document text
    • http://inica.org/files/file///gikitujota.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/nogifopipetesumilunow.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/51599766863.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/85088601106.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/33810715018.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/vukofuki.pdfIn PDF document text
    • http://goldmustang.com/files/files/kosexodobu.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/1141669039.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef03bbea74---36652411013.pdfIn PDF document text
    • https://kristinanamaste.eu/files/motugesotanugixabemasaju.pdfIn PDF document text
    • https://dcimx.com/files/rogaxedaladifekaper.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/wawutapedetigilol.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/81785482733.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fuxopupe.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2cff1982b95b51740129b0752f75ee8d/polalogazelog.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/99865103439.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/gotigusifaxekunob.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/68493404263.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/kageri.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/xasutadexemogigozawefo.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/sukinipasotazogifefi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/bebimokefororovemoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nomao+camera+app+downloadPDF link annotation
    • 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_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 17440 bytes
SHA-256: 69f6ee8aec9dd9e4907a5ce8819f38eb7953b8f6d83b7f6359ca32bf7046be75
font_01_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 10380 bytes
SHA-256: 7c70ad5a6132220d7225aea217bf5d176a3a82285ce19736fb3e147ea07987fd

Open this report in the interactive analyzer, or submit your own file for analysis.