Malicious PDF — malware analysis report

Static analysis result for SHA-256 4104698e6d01f0d3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 17:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b030f1419039a95a4f303833049765f0 SHA-1: dff9c55cd6768b1c025a1395786ac3c5524606ce SHA-256: 4104698e6d01f0d3d32ee8ba0ad2bce187de2f90028398956eca1abe134e6e4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true malicious destination by presenting a large number of seemingly unrelated links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tpokebar.com/uploads/files/82600619509.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/budilegiduxupebe.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210915203315.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/pizukumemupodit.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/18220069951.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/wuwom.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/ledek.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/91416922701.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gawesinap.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/22722271856.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9dd5f0164ccc06b65fb4615299258c45/54667158567.pdfIn PDF document text
    • http://ellev.fr/upload/files/zerumu.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/58551494200.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/muwedimetibuxef.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/45348102993.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/betunowuragiloz.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/50776573449.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/boxamiwakarixika.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/23761530719.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c596ab811---42658565661.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/83105364380.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/54191411476.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/25774768809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=black+friday+smartphone+deals+2020PDF 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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 11388 bytes
SHA-256: 2f238fe0366629aaca7322141b6dac5c12257d7a4a03a07add97162f9e9c55b1
font_01_sfnt_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 15960 bytes
SHA-256: 01f40f3267dc1f533729fdc7aebe3fb56d2dd325705bb1e9f8f688c3614f2d6f

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