Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6df0e902e310fe2…

MALICIOUS

PDF

37.2 KB Created: 2020-06-14 23:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3abdf271721483aaabb7839f67fcd4 SHA-1: d7e9e07d7c8e03b382fa5aeffd208d3fb8cfbce2 SHA-256: d6df0e902e310fe2e9f99d3be00fa3c5a344024421c8e45b10e8c181dcf5451b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with SEO spam or link farms, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains text related to PDF conversion and URLs that are likely part of this link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a lure to a malicious website, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://millenniallust.com/uploads/1/3/0/3/130323302/130323302.html#convertidor+de+pdf+a+word+rapidshare
    • http://realisticmaw.com/uploads/1/3/1/1/131163897/wajuw-wanabegirog.pdf
    • http://facultyretreat.com/uploads/1/3/0/7/130774979/tazuradilefutorika.pdf
    • http://webdisk.eltapancocabinetsandmore.com/uploads/1/3/0/6/130604881/01338e03d.pdf
    • http://webdisk.driftwoodshoresdesigns.com/uploads/1/3/0/2/130289563/4930663.pdf
    • http://worldvillagesproject.com/uploads/1/3/1/3/131380213/4146082.pdf
    • http://admin.hwupenyuproject.org/uploads/1/3/0/6/130639784/paxapuselipegi.pdf
    • http://behave-aid.com/uploads/1/3/0/7/130774966/5802840.pdf
    • https://zujulesi.files.wordpress.com/2020/06/velidogasubesekofi.pdf
    • https://bidaleb.files.wordpress.com/2020/06/jofenesawoxu.pdf
    • https://pinorujap.files.wordpress.com/2020/06/62862523460.pdf
    • https://ruxurogizipo.files.wordpress.com/2020/06/kexizuxokimomodiweve.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a7a.bin
d2b4fb30afdde71f45317a6747f16a482b0b780d7e3d9bf45ea216303efe1cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7A 20264 bytes

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