Malicious PDF — malware analysis report

Static analysis result for SHA-256 8828b83c1f61eef3…

MALICIOUS

PDF

35.4 KB Created: 2020-06-22 04:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: f2806c463fe836047958c65f3ef18cb8 SHA-1: e69cf111479205e1811b36c0285dc177439fcd5c SHA-256: 8828b83c1f61eef376fe4d3bce4f12d74c8bb8a5ff409783c761c5f3a37f0e0c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed for SEO manipulation. While no scripts were directly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to drive traffic or potentially lead users to malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://buildingblocksforlife.net/uploads/1/3/0/6/130603682/130603682.html#insert+a+photo+into+a+pdf PDF link annotation
    • http://3pw.undesirable.us/uploads/1/3/1/6/131636977/5778637.pdfIn PDF document text
    • http://ch.breakthroughtc.com/uploads/1/3/1/4/131438461/ea65435cce.pdfIn PDF document text
    • http://carsonsphotos.com/uploads/1/3/0/2/130291371/1080481.pdfIn PDF document text
    • http://routestoknowledge.com/uploads/1/3/1/0/131070792/pakesegukakan.pdfIn PDF document text
    • http://vrmuth.com/uploads/1/3/0/6/130621294/fbef9c0953.pdfIn PDF document text
    • http://mcctorg.org/uploads/1/3/1/3/131398268/3894774.pdfIn PDF document text
    • http://mail.dolphinvacations.net/uploads/1/3/0/7/130776260/linuwexizaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA1 4820 bytes
SHA-256: 0a4c08ff4c4577b2df1507c78a91a7b191040d3bee785066798775d180af8f63
font_01_sfnt_off00005de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE8 10628 bytes
SHA-256: b844b176e5322c42629dcb8c4dc6e6fb5b6f07e3a3f8f861260903e7de5c93bd

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