Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcaa828956d5757…

MALICIOUS

PDF

40.6 KB Created: 2020-06-19 20:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9c4d4439e817c714dfc8f3cb8c72450c SHA-1: d1af657eeab0d3f078f321f87c58e801eb87a922 SHA-256: dbcaa828956d57570b2e358db9144bf85df34854fe5a5e3692037deb22367800
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The document body, though partially corrupted, suggests a lure related to 'States and their capitals in India PDF', but the primary function appears to be redirecting users to numerous other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mta-sts.school-alliance.com/uploads/1/3/0/4/130489650/130489650.html#states+and+their+capitals+in+india+pdf PDF link annotation
    • http://ns38.ezexs.com/uploads/1/3/1/4/131437839/df1ee6e55.pdfIn PDF document text
    • http://bisoninvestmentconsulting.ca/uploads/1/3/1/8/131856326/3395131.pdfIn PDF document text
    • http://webdisk.c3power.org/uploads/1/3/0/5/130542909/nededudodusofun.pdfIn PDF document text
    • http://webdisk.casavaqueros.com/uploads/1/3/0/5/130588622/8793468.pdfIn PDF document text
    • http://christiansoundsandpictures.com/uploads/1/3/1/4/131408241/fobiwe.pdfIn PDF document text
    • http://hotchiwitchi.com/uploads/1/3/1/8/131856108/bopako.pdfIn PDF document text
    • http://permanentcosmeticartsetc.com/uploads/1/3/1/4/131408502/d1c14f1c156e56.pdfIn PDF document text
    • http://swedeshop.net/uploads/1/3/0/3/130313459/331694.pdfIn PDF document text
    • http://ftp2.custom-mfg-eng.com/uploads/1/3/0/7/130775854/kebalejipunokej.pdfIn PDF document text
    • http://faroutpaints.org/uploads/1/3/1/3/131380342/9371430.pdfIn PDF document text
    • http://jobsight365.com/uploads/1/3/0/5/130588452/mitader-setuzi-sukapamoduji-pewuduwegedaked.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 5024 bytes
SHA-256: c8057ccaf2de48be63dc6fc5381fa059431e73d7c2f5df4e113513b667072091
font_01_sfnt_off000071d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D7 10644 bytes
SHA-256: 30639ae2893566b4f617d96bd44f3d198f796ca227f594b840e339763b0bf0ee