Malicious PDF — malware analysis report

Static analysis result for SHA-256 819005f12405dcbe…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 18:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ccdefcc084b919345fbaa24ef3fec98 SHA-1: ba921a3ee42a8b4f42a3ce4fe769ca1410f511c8 SHA-256: 819005f12405dcbe56e5ee93a507d59033b3f2e7c2e9be9d4b3e54288ef0ae15
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the presence of many external URIs suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krisoc.ru/uplcv?utm_term=itc+paralus+app PDF link annotation
    • http://burelomdo.com/ckfinder/userfiles/files/11442013205.pdfIn PDF document text
    • http://zimmerei-possert.at/tekoxo.pdfIn PDF document text
    • http://e-sportis.com/images/upload/91415696780.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/41559852822.pdfIn PDF document text
    • https://il-gusto.com/images/file/ziruxedutujebewugawobebiz.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///xuvebupo.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/retuvajajufatovazevafib.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b469a2c6ba---fotuzezugomubobovu.pdfIn PDF document text
    • http://podarox.ru/public/files/soxokima.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/62426393471.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/52751649802.pdfIn PDF document text
    • https://nasikampung.info/contents/files/7766822792.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/ledozuzunidusotavosazo.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/kiterixo.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fuvalemebogu.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210912020402.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/27805228022.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210908215847493574mlud7.pdfIn PDF document text
    • http://rrarental.org/upload/file/35298530558.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/58927240389.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/gaxebiwuxururaripifoduv.pdfIn PDF document text
    • http://biosite.ru/images/news/file/39633907590.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/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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 17528 bytes
SHA-256: 2f543d3a9758c28ebb6cbdcbc1dedfd542eb30bd908780fd1f655d91431e5d9e
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 9968 bytes
SHA-256: 50c3283e8f72d8edf55356b951290d838460ca921a4cfa0e94795945e8d2ed7a

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