Malicious PDF — malware analysis report

Static analysis result for SHA-256 2196a6fa15bf6d3f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-10 02:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87d09fb774a55eb52ecbff8c6521ffc8 SHA-1: 96f55639903a6dd88bac57264b0dc2cea6ddddf5 SHA-256: 2196a6fa15bf6d3ffb7c60454753c17ee897cf03435b4c6e6202e142ac569b47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to form a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=how+to+change+gboard+emoji PDF link annotation
    • http://jvcc.cn/ckfinder/userfiles/files/210908222322972113546w6.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/tebesutibiru.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/34043445745.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/48614767646.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/funukaselulefutarimadadez.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/rujemetusu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e6ace419b0c8c94a1963300586cac304/92483375530.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/wokopaxo.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/44976256861.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/duzimorug.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/mularirabidiboboloma.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/81968848731.pdfIn PDF document text
    • https://migger.dk/userimages/file/80426143116.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/pepokugodatomirigop.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/misurado.pdfIn PDF document text
    • http://fruitvita.com/files/files/17979503889.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138320af3ce9---virexelogudojil.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/duziv.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kifiwasis.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/dafawetap.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/dogekiroli.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/vetuvogexik.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/66937975241.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/zedilomapulobolexubawop.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fafenejugerebutipenegiz.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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 10952 bytes
SHA-256: 909e7a008c5a1b957e285625101ded6e557cd9ff8513c55591689f3c060a54de
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 14748 bytes
SHA-256: 21c742b1cf8266f0f5a2f97a5cf268b5793a717eb8ac80842fec6ffa05bc213a

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