Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcea36e0139cb1b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 05:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52926ff227b045e5a48198032d163179 SHA-1: 9216f3e95ddd029cc4ce487f7743366be40e6915 SHA-256: 4bcea36e0139cb1b40033648d45c2192112e15e7822cc142f37b473569655f3c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to deceive users into clicking on these links, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://garglob.ru/uplcv?utm_term=kotor+2+free+download+android PDF link annotation
    • http://mousike.it/img_ins/files/pibidikoxoxiduna.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/52619738959.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/73310568821.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///teloviwenumevevadalodabo.pdfIn PDF document text
    • http://centronegozi.com/public/vizelobefapufisav.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/42814075217.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/62069914521.pdfIn PDF document text
    • http://www.heksan.com.pl/file/rizog.pdfIn PDF document text
    • https://sim2007.com/files/banobuxad.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/28157739631.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6833033670.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/80440683830.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/41712210028.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/32122914943.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/99851805694.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07ee7353d5b49e8d9730aaeeda7d8c0b/faburew.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/metumutamuvigaf.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/suwutevefalapedefudirosum.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/lozilopemij.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/nosolewakavaxezudoru.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/10189339270.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/37733541686.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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 18000 bytes
SHA-256: 6c6228e71687570190a65ae8954f701bb54b55864e8b9cf05dcda2c092c28d99
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10376 bytes
SHA-256: c279bbbb1af768ff4d75d6a82712011dccd8c987a8cd1f0660877725dc67abf6

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