Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae3200222083561…

MALICIOUS

PDF

66.0 KB Created: 2020-04-14 08:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cca3ec5ae93aca0f8807269fedc30828 SHA-1: 0a8ae2c42fde5dab04fbbd3c2d6224da4cd7e3f9 SHA-256: 1ae3200222083561dd2ba4ae397a255c4354b951713cdf3f5966a31e2670347a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are structured in a way that suggests SEO spam or a link farm. The document body, though heavily obfuscated, contains references to a 'European journal of emergency medicine case report' and the wkhtmltopdf tool, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://porgrace.com/uploads/1/3/0/7/130776067/130776067.html#european+journal+of+emergency+medicine+case+report
    • http://khemarketinggroup.com/uploads/1/3/1/0/131070695/jurok.pdf
    • http://marthanorman.com/uploads/1/3/0/7/130775350/945471b.pdf
    • http://jayis4justice.com/uploads/1/3/1/3/131397927/8902990.pdf
    • http://dollardazzler101.com/uploads/1/3/0/7/130740249/7473689.pdf
    • http://mackenzieyork.com/uploads/1/3/0/5/130588443/kotakoxavewupu.pdf
    • http://millrightsolutions.com/uploads/1/3/1/3/131384429/laxizizebeluri.pdf
    • http://yongonzalezinternational.com/uploads/1/3/0/5/130541597/sugona.pdf
    • http://arianabina.com/uploads/1/3/0/6/130621125/dumiv_fiwejoku_jonigiwebaro_tazox.pdf
    • http://ipleaseyoutease.com/uploads/1/3/1/3/131398004/gusibetefa.pdf
    • http://littleshopofhowlers.com/uploads/1/3/0/2/130291624/b445612b8660e.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_off0000db37.bin
07eea274bcce889eb8288e4d4b4db6dfbce01bc61ec886dca104a8c66cc66b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 8424 bytes

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