Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ecfbe6a7700a05…

MALICIOUS

PDF

46.5 KB Created: 2020-05-19 13:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 9c487db0f94af424413e61bf88af8ec9 SHA-1: 44a134af79391c0184bf7d2981b36c143096ca64 SHA-256: d2ecfbe6a7700a05a966a13e6380f994e9c0cf1e049e061f4ac8c04be2238e71
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam technique, designed to drive traffic to various sites. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://asociacionperiodistaspr.org/uploads/1/3/1/1/131163834/131163834.html#grey+seal+elton+john PDF link annotation
    • http://biahauling.com/uploads/1/3/0/2/130272586/575ee2b09a72c96.pdfIn PDF document text
    • http://bunya.shop/uploads/1/3/0/8/130874668/780a1c6390049.pdfIn PDF document text
    • http://vkphoneparts.com/uploads/1/3/1/4/131454178/7181201.pdfIn PDF document text
    • http://namiwashcounty.org/uploads/1/3/1/6/131636949/kudixobasozunaxu.pdfIn PDF document text
    • http://powertrip-comics-and-ephemera.com/uploads/1/3/0/7/130739839/cc244bf.pdfIn PDF document text
    • http://silvanagoldemberg.com/uploads/1/3/0/3/130312972/746015.pdfIn PDF document text
    • http://dinner-ateight.com/uploads/1/3/0/7/130739927/7934072.pdfIn PDF document text
    • http://sacredgroove.net/uploads/1/3/1/6/131636862/lubirepojuduranu.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 3

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8877 11928 bytes
SHA-256: 0282aed072e9a120c280e54e00a90ad28bd29f3037bcea69c9469a15e08c81e2

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