Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b559f1deeec672…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 10:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1a66a283787e2a3bf32ad5dfba190d5 SHA-1: b00d4cf71f4671e0e6fde0eb8de0d25b8df152a4 SHA-256: c0b559f1deeec672762712b1cfd25cd693e1fe5e733865968299ef14483337c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains numerous links to external PDF files hosted on various domains, suggesting an attempt to redirect users to malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://huntic.ru/uplcv?utm_term=come+installare+due+app+uguali+su+android PDF link annotation
    • http://soles2walk.com/data/file/vovirixuwafepilu.pdfIn PDF document text
    • http://zimmerei-possert.at/wotisofotidabemarobupofa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139641d47b36---jaxokomudonasamobima.pdfIn PDF document text
    • https://profesa.net/userFilesfile/97372453044.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/valelulepafemi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109090151365317.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pelasomi.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/82439601638.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/forewubiputaxuveguxisari.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/kisopatazivawatin.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/zidalijosojagaguvuzolo.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/boluvu.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/65271745999.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/53219217302.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fab0137d9---65686918537.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tevimuwekizere.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/ruxuvotebelenazawupemamu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/takuzekakukaduno.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/sumikeje.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/51971298738.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/45254423743.pdfIn PDF document text
    • https://soechi.id/userfiles/file/fekamanefagisibuwit.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/radog.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/vemilekexiwerubizoji.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 17452 bytes
SHA-256: c42a1a4b92e7db6fd89c18745213254a9e7d80dc8f0fb2cb63d709b9dcfd17be
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10864 bytes
SHA-256: 6ca93608ade5ab45d76b28e64281a6d0a29a399edaa275df78b413e30dce1cb2

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