Malicious PDF — malware analysis report

Static analysis result for SHA-256 02685ea4ebdb0e54…

MALICIOUS

PDF

37.8 KB Created: 2020-05-16 21:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da297bd9f7ad324b6f870d5ee9a24a1e SHA-1: c62a268024dd2ce188524681f031678564e1606d SHA-256: 02685ea4ebdb0e5466a721d2ac7278e11a4481cd9274d30d4afd4eca758b9d29
104 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 point to other PDFs, indicating a link farm designed to distribute malicious content. The document body, though obfuscated, contains references to accounting basics and URLs, suggesting a lure to encourage users to click through to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://glimmernglosscosmetics.org/uploads/1/3/1/4/131482864/131482864.html#tutorialspoint+accounting+basics+pdf
    • http://littlebirdsmusikgarten.ca/uploads/1/3/1/1/131164497/6582402.pdf
    • http://yonahadi.com/uploads/1/3/0/6/130605078/gavamanoxivadozede.pdf
    • http://landscapingteatreegully.com/uploads/1/3/0/6/130639888/jupuburesivelak.pdf
    • http://myquickclicks.com/uploads/1/3/1/6/131636852/4059791.pdf
    • http://cewlearn.com/uploads/1/3/1/4/131482882/8069909.pdf
    • http://goodetranslation.com/uploads/1/3/0/8/130874101/pikobodavarit-nipapafeb-gozonebipo.pdf
    • http://roeinmn.com/uploads/1/3/0/2/130289377/0920978ee2a441a.pdf
    • http://cmariedesignss.com/uploads/1/3/1/0/131069970/70b2b674f41.pdf
    • http://e2cos.com/uploads/1/3/0/6/130603979/gexezirowe.pdf
    • http://thehikinghousewife.com/uploads/1/3/0/3/130324241/kivofewonewed.pdf
    • http://collegefundsnow.com/uploads/1/3/1/3/131383977/2533811.pdf
    • http://affordablewaterheater.com/uploads/1/3/1/4/131453431/juderu-zevojimi-falopozaboje.pdf
    • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e8.bin
0d40c5492256f1e641c40c595c9f140201bc8c25a967b1cd9766e5d259152374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 10588 bytes

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