Malicious PDF — malware analysis report

Static analysis result for SHA-256 407d755be6b29bdc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fb82fb5fffc50002e1c627255548cbc SHA-1: e187ff2645a559445136d2766f075b7f7df5dacc SHA-256: 407d755be6b29bdc60db7f7b302d05cd190ab2598c24574a05a510c096c337c3
66 Risk Score

Malware Insights

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

The PDF document was identified as malicious by an ML classifier and contains numerous embedded URLs pointing to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of multiple external URIs and the link farm nature suggest an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=impossible+quiz+2+answer+7 PDF link annotation
    • http://zabbeleecooking.com/ckfinder/userfiles/files/jirovidexujedowokatixelu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • http://chapelguild.com/images/usr/96154524389.pdfIn PDF document text
    • http://hidramaco.com/files/files/zowewisawafaz.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/72348754238.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/25129519091.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/86021648578.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/matajifugi.pdfIn PDF document text
    • http://telektrans.hu/editor_up/39130974901.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/28531993911.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/58314340921.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/73898685247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147490d9fc6a---sidikoxelokofel.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/63835264276.pdfIn PDF document text
    • https://membermimpi.com/contents/files/6391697165.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/2222670569.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/27656394632.pdfIn PDF document text
    • http://indemo.pl/Image/files/19353301313.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/gaforegifujew.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/rijawotes.pdfIn PDF document text
    • http://weshare.vn/attachment/files/12581623543.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/77745647910.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630711527.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/88705640937.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_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 10968 bytes
SHA-256: 7f8fec8e3892bfc458cb665795132eef0aef4f34c3ecd573e2768440ed7e1365
font_02_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 17488 bytes
SHA-256: 139bb6661fba94c83f6ed6d71a03422ddbf217528cae7084c8e2ccd7221f322b