Malicious PDF — malware analysis report

Static analysis result for SHA-256 5200c32896b90541…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 732cbadc46e94c94612eb058bbae4edc SHA-1: 5aa9cd598afe536989a61d6243bf35d60156993a SHA-256: 5200c32896b90541d4380753736da9d114643fc648fa0bafe744e7e56cdb6116
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a larger distribution or redirection scheme, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 4

  • 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://larben.cz/media/images/upload/file/rimowojoxoto.pdf
    • http://zsdbiopharm.com/upload/files/jodet.pdf
    • https://lajovisena.com/gallery/file/24103249166.pdf
    • http://ingegneriarossi.it/userfiles/files/lufujonuvadobe.pdf
    • http://aire-limpio.com/img/editor/file/wuzodipewalewufunozivevov.pdf
    • http://studiotecnicostradi.eu/userfiles/files/lulimilej.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/wawisonibem.pdf
    • http://yourbuilding.ru/userfiles/files/kuwetoz.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/7346715821.pdf
    • http://www.musicboxpiano.com/contentfiles/xogenofukovase.pdf
    • https://simorgh.it/uploads/file/70681918859.pdf
    • http://joyerialaplaza.com/ckfinder/userfiles/files/23836421332.pdf
    • http://gancza.pl/userfiles/file/95327699320.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/7170962407.pdf
    • http://colafranceschi.it/userfiles/files/66324834111.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vonavuvukosexijoxa.pdf
    • https://hebatkeren88.com/contents/files/tugobajaxakisesiloga.pdf
    • https://beldapromosyon.com/calisma2/files/uploads/23096326030.pdf
    • http://metall-press.ru/files/bisakudawufuwizit.pdf
    • https://mudraconsultancy.com/uploads/files/44224710981.pdf
    • http://irinabailey.com/upload/files/26888732074.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/92766271164.pdf
    • http://abwingstop.com/uploads/files/42750900329.pdf
    • http://michalpavlicek.com/uploaded/file/93066027463.pdf
    • http://stylekd.ru/files/labuserasezujol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grand+theft+vice+city+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d339.bin
9270f67a1ac0eab3a6a06d23f86e72e34f6c92f9cbe6d7a5e9b97bc8152a98e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 17908 bytes
font_01_sfnt_off00010167.bin
d64fae5d9bf438e1e37c125f66fde312aaa9b301ef5b215dc3e6aa7141933155
pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 10692 bytes
font_02_sfnt_off000119e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 16792 bytes