Malicious PDF — malware analysis report

Static analysis result for SHA-256 f339c021ef093242…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 09:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b9d2b21f4861618f28fe2e95b9acff0 SHA-1: e1189b79623f13740f849c17382e91b83254b59b SHA-256: f339c021ef093242dda3d5459d7a3070eaef6d613711d11821c13e57ab54b5a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, 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 external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://geostudio.eu/userfiles/files/43712891227.pdf In PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/55870941546.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/17283372532.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/47950760100.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zenavemenetafa.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/vagowivepovuwobisubi.pdfIn PDF document text
    • https://brs.jo/userfiles/files/lofikimeta.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/jozujugidexarilutejizebo.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25483090696.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62871918942.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/72714059494.pdfIn PDF document text
    • http://handgun.ee/media/file/pesuvofupasewo.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62694734257.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1n2t3lmkoo89bo07ggm8c7rm36/luruxe.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/6528368441.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/71325824506.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/muvujufapigiwad.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192051534123.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210918_154752.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/rezemuwodibomuzanimumer.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/1647292422.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/kajinuxi.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/saxuborigar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=five+nights+at+freddy%27s+3+play+free+onlinePDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/197785189.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_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 11140 bytes
SHA-256: aed5262132de2e83e77e59dba4e2ef567ddaaf66e9b361ce0bc88b70e671c98d
font_02_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 17132 bytes
SHA-256: 7cae8512fd7227f4e4863e4ca012b1bc841ae568181a1f53bb94443c1364764b