Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcd9688ddd7abb5…

MALICIOUS

PDF

89.9 KB Created: 2021-09-11 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ae8c9c3f4bebcc1082cfc7c52102695 SHA-1: 5e959d6d5efab5a122c8c7bb73961841edc9a515 SHA-256: cfcd9688ddd7abb5cb86c36b8a8f0add38fbe4f592dfa56bd5c9f99f14320d95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=%D8%A7%D9%84%D9%85%D9%84%D8%AA%D9%82%D9%89+%D8%A7%D9%84%D8%B4%D9%8A%D8%B9%D9%8A+%D8%A7%D9%84%D8%A7%D8%B3%D8%AA%D8%B1%D8%A7%D9%84%D9%8A PDF link annotation
    • http://f-okinawa.com/img/tmp/files/62345922180.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/99890046798.pdfIn PDF document text
    • http://eternoohydro.com/d/files/sekuvevidukadonipusi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/94490304372.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/lififowasizukevatejemiwa.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/36956551115.pdfIn PDF document text
    • https://onlinendttraining.net/files/tafujidiniben.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04cd9a7de---siwixiwavamikasomo.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/48275133469.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/tamejubamarevatowomevoxa.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/20576116525.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/jipafasodurum.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/zidukixobe.pdfIn PDF document text
    • http://infosierra.es/images/editor/fevijodivanoxitomu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/zidugugixuvobojoparuj.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xufisosipigab1631193351.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/ligomofozegod.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/zemebisaworujimo.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/51701808958.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/19391593806.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rabepuxisop.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/26515220414.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/9901534752.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d700.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD700 25076 bytes
SHA-256: 780669aa216bb6262da52aa999cb7bcbc360aeccea6a659c97ce0980f1ad36bd
font_00_sfnt_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 18540 bytes
SHA-256: 4bce9afe804867bb1059d0c34b3c10f9052abdcc8b1824664bdf73435a81396b
font_03_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 21796 bytes
SHA-256: f14d2683cb9eb2e909ff4d7490981c90d0cd6ebb7d0658d5e964a2219254b215

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