Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccffd5e8a8db581…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 18:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b385a845e8b39ec0a76f8ea2e065512 SHA-1: f429f172e5a98a21e0076421f018b2bc11a3c341 SHA-256: 5ccffd5e8a8db581629201ca6ecda44d30dacc2410789191f9dd2b126321ed8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting an attempt to drive traffic to potentially malicious sites. The PDF structure itself is also noted as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://medvor.ru/uplcv?utm_term=best+blue+light+filter+app+for+android PDF link annotation
    • http://www.alfapilates.pl/upload/file/nimotixuzulozisepegusi.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/10336919601.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c190ebe5f6---miturilur.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/fitawibexizuve.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/136556530.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zatajoxurijufa.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/bebiwinumakuvamukojirux.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/42879913401.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/jabugezewonita.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/32366520177.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xibibapol.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ca6194b5---fekedevizenasakok.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/kibubirepovada.pdfIn PDF document text
    • http://findacommodity.com/upload/file/malijedebidewitepepiwawu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/15192345123.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fepopojabedibixiwufej.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/wekexer.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nepowutifodafojufam.pdfIn PDF document text
    • http://laserinnsbruck.com/static/93061604008.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wubuwibedesojusasilirim.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 18380 bytes
SHA-256: c7af18228078f914726d06ef2db58bab495e6a92010b8a04a42324316fd3f6c4
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 11068 bytes
SHA-256: 8d114c71e5473a9e65fa6fc5e62b16e96cd3c3c58e21c47c4aa3ef4d0bd5c12a

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