Malicious PDF — malware analysis report

Static analysis result for SHA-256 942c603371f483f7…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 19:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b60452caceae31c680ba51b0fee6c1 SHA-1: ebe72789c284758f9a49e3f71c6cbc882e3b4122 SHA-256: 942c603371f483f7b45cf52c9ca4f76b451cd407b2d15664e7c1dcfcf524bb6a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/award?keyword=learn+correct+english+conversation+through+pictures+book+1+pdf
    • https://lelugawe.weebly.com/uploads/1/3/4/5/134590829/migozitetevedelimebi.pdf
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/relanurevurigoporefa.pdf
    • http://kivedunorujuw.66ghz.com/cardiac_arrest_usu.pdf
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/3323370.pdf
    • http://silusexiva.iblogger.org/42064684355.pdf
    • https://baxiboxizalitif.weebly.com/uploads/1/3/3/9/133987723/zapixixegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mimiwuzoxul.epizy.com/process_architecture_in_biomanufacturing_facility_design.pdf
    • http://fowimifefezujo.myartsonline.com/70726251114.pdf
    • https://s3.amazonaws.com/tojabixefova/mexinabutizejeniz.pdf
    • https://s3.amazonaws.com/benuka/math_worksheets_for_grade_5_area_and_perimeter_word_problems.pdf
    • https://s3.amazonaws.com/davubewu/fivesisomotitawajatip.pdf
    • http://nujexaraxeb.epizy.com/zesaragunolulix.pdf
    • https://s3.amazonaws.com/jakujakula/69231669686.pdf
    • http://zeteximezoxa.myartsonline.com/carl_gustav_jung_libros.pdf
    • https://s3.amazonaws.com/sabegokek/10298884599.pdf
    • http://tumanababaxa.epizy.com/fefejuduzetekubugenujajij.pdf
    • https://s3.amazonaws.com/gogonof/75188444109.pdf
    • https://s3.amazonaws.com/lakadutof/57916040421.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e8.bin
3eb480822eac823759c67c23ff6c8a2db757873a92f7d615b06adbcbf63e70f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5676 bytes
font_01_sfnt_off00010636.bin
4f5628b3ff50d9e8f6ef8fc1b1099b53490bee384d1fd4af58b6750268228f43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 10188 bytes