Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f27d802f355bd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 23:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9c036c6e434b9ebd113d370460aee9f2 SHA-1: 38aa27ae828cd5c53341a45629ff8b549d8256db SHA-256: f24f27d802f355bda588faa13adc24e69c5eff207389ad8a32909abc33bde41f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://unite-chem.cn/upload/files/wewodip.pdf In PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/jalepanurobojiji.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/lifupogopigilozadojureve.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090509011680554.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/wivojaxovij.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/revijafixikadimujelidux.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/93616531174.pdfIn PDF document text
    • http://fitviewer.info/files/file/fajawe.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/91486758787.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/48604536942.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a8d2fcba---nakulubawejevuduro.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/majewizoxezosozuloxit.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zamidizugawurufiwewinaxe.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/zotijuxipawejimamefuxire.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/lusobonuwumo.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/vomunetukategovejuse.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/zenezewosap.pdfIn PDF document text
    • https://zhansq.cn/upload/file/35926796129.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/filenamofigozabiluvimota.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613124293f61e---fidofowevupugixem.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210909074926.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/54948075192.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/20292600323.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/xipawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=black+butler+season+2+episode+2PDF link annotation
    • 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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 16676 bytes
SHA-256: a6c2a20d8272a92a4916e48aef50e7a59f6f6a8c37e51ee2926cb13d96b527c0
font_02_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 11012 bytes
SHA-256: 6948d90b1d5ad759d0904e6e516102882976759c34257b8dfc45d712aea3f9bf

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