Malicious PDF — malware analysis report

Static analysis result for SHA-256 211decf37d761875…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 13:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c86899a457e14690ca163b69d65f6d9f SHA-1: 54204749cd1a57021c68b63f80cc59518b45b3fe SHA-256: 211decf37d76187528fe302ab09a67f58e2a03c1a30f9401b2abbad34caee832
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous external links, with many hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xuanhongkhang.com/upload/files/63143903147.pdf In PDF document text
    • https://revive.fashion/upload/files/40764514618.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cdc30f76a97df9efc3b7dce00c3c19bd/46640381294.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/79299963576.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/koretekaduna.pdfIn PDF document text
    • http://space-edge.com/upload/files/fofufi.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/5900563873.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/67374551452.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/21c942a860a931cb5253659a48dbb9ee/puxuwalag.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/45354948456.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/50080845925.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/48485915388.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/89030238171.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/77257662746.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/65378154316.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/5316882704.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80499319843.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jodajiwemolefapo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/43199697615.pdfIn PDF document text
    • http://askort.pl/Upload/file/kabenoruxinefozovabemalun.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/vofafelut.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jowepawebowumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=information+report+examples+year+3PDF 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_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 17268 bytes
SHA-256: 3f3517f98f93a7efc7b510fef44d2f12917a5620f8afaee3ada18f3fe048d9d9
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10860 bytes
SHA-256: 6564dba00a3a3d207e7aade20e544aea4922091299f8cdd5327a8ff18f581455
font_02_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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