Malicious PDF — malware analysis report

Static analysis result for SHA-256 255bd12890146d64…

MALICIOUS

PDF

79.3 KB Created: 2020-11-21 02:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8faf317c55179c3751eac5b4b350de SHA-1: 1eb7f57415419b4f74eb2767e7bd32f31ba56bcb SHA-256: 255bd12890146d641b7740ad4ca3190f92096c857d82622da27d748981ea5946
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, indicating a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this malicious intent. While no scripts were directly extracted, the nature of the PDF and its embedded links points towards a phishing or malicious redirection attempt, likely initiated via spearphishing.

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://traffset.ru/123?utm_term=india+eu+trade+talks
    • https://xelefivaj.weebly.com/uploads/1/3/4/2/134234850/8886066.pdf
    • https://febefuso.weebly.com/uploads/1/3/4/3/134382796/sujuxitan-rekejotav-bogujeketolamer-juson.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/nimipulasosa.pdf
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/zenipele.pdf
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/8fca0.pdf
    • https://vavagufone.weebly.com/uploads/1/3/4/3/134345741/walowufusosuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rexogeguxosix/template_rubric_for_debate.pdf
    • https://uploads.strikinglycdn.com/files/63b28eea-9825-4b5f-b0f3-17e2f6ec4730/stephen_king_short_stories_online.pdf
    • https://uploads.strikinglycdn.com/files/6c1316bf-27b4-42a0-ba6d-4d4aea8ec708/88515670675.pdf
    • https://s3.amazonaws.com/wonoti/6376151362.pdf
    • https://s3.amazonaws.com/tomamujuf/67965207109.pdf
    • https://s3.amazonaws.com/dazinibonofobi/20809514862.pdf
    • https://s3.amazonaws.com/megelugik/2717585536.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
    • 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_off0000e3e5.bin
856ff0c7c82562ec96a14eab2b0ff7956ad485dc1e1824c1c9d7d31df06a281b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 4820 bytes
font_01_sfnt_off0000f451.bin
99dccf19e642d77035f3ec328365cd96a00d68037975cc265c47684822ea9327
pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 11232 bytes
font_02_sfnt_off00011ab8.bin
94c0bae19f80e781b855ec711ffc07fe799db70e3aeab0d0f2f33f4d416d2bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 16348 bytes