Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3240f88d975f9c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 11:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c01096251b4cd1347c31686fd0195a84 SHA-1: 47a73f6ae7eee2fe125958b455c2d2b9b9adc20f SHA-256: 1c3240f88d975f9c9a2a44f92cff5993207b03aec97f898c75296b2b4b7015b0
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, and a heuristic identified it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://geologocarmignani.com/userfiles/files/14841003762.pdf In PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/41931030915.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/24403910804.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/78696182910.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/99325961165.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/77181660502.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/korufebodigesofok.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/47778469889.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908170441.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/bikegowokafiko.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/komip.pdfIn PDF document text
    • https://southafricapools.com/contents/files/42078715913.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/93002205525.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/54303570369.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133427b36143---77560708772.pdfIn PDF document text
    • http://gr-chem.com/upload/files/55318992225.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/ferumudinapabopu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/todijideraturudaj.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/46531066276.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/75392903547.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60c6d028---ziwunipavafizetisoruti.pdfIn PDF document text
    • https://davnosti.ru/upload/76615295967.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dilirepeluxuratejabof.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/xaguvubogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=6+letter+words+starting+with+kiPDF 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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 10776 bytes
SHA-256: 2c4a71faabc5beb837f7efa9dc5965e524d415cbfb9cbdf5e3a7eb56fff5b633
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 17936 bytes
SHA-256: 9cb9fb058d9897495910aca0b12acf7ca9c0c314f5630fead6b93eb40ff43942
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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