Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f4e4d70ac9974f…

MALICIOUS

PDF

63.7 KB Created: 2020-05-17 06:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 539f57c809f81194ccf42224147970b7 SHA-1: 48d322adeb06daf38bee3db8eddb366f1b84b7e0 SHA-256: 09f4e4d70ac9974fc87fde7765aefe16bf9454a820db4b9dfec6a10fff8cd9a0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a high likelihood of redirecting users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://hplministries.org/uploads/1/3/0/8/130814195/130814195.html#bhai+dooj+status+free
    • http://peacefulplacecrisishome.org/uploads/1/3/0/6/130639484/tepoxikenuj.pdf
    • http://worldoftrading.net/uploads/1/3/0/4/130483645/manuteg-worabi-tegamolorora-fesamipukula.pdf
    • http://karishkreations.com/uploads/1/3/0/3/130323249/tugodajufozi.pdf
    • http://mirandacraig.co/uploads/1/3/0/6/130639506/d73ac50.pdf
    • http://midd-lax.com/uploads/1/3/0/5/130546343/7152426.pdf
    • http://globalisationindia.com/uploads/1/3/0/6/130620861/tufufupavo.pdf
    • http://bringyourblackexcellence.com/uploads/1/3/1/3/131384289/4ab7f600f9b3.pdf
    • http://autokeystatenisland.com/uploads/1/3/1/6/131636772/3557960.pdf
    • http://baylandesign.net/uploads/1/3/0/6/130604034/1980757.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000c108.bin
a0c681533a2026af1b1d61a9b31ea05c81768f3fcb8ba010ce080f21d643f905		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC108 17828 bytes
font_00_sfnt_off000090d0.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D0 3720 bytes
font_01_sfnt_off00009c32.bin
b152e3360faa731caefaa495a7110adf6b37240d713c5f3e941e6a71c2ac9db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C32 10696 bytes

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