Malicious PDF — malware analysis report

Static analysis result for SHA-256 05534e43ba55c74c…

MALICIOUS

PDF

31.1 KB Created: 2020-03-07 11:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b639d9872579ae6fdd504129a0c93936 SHA-1: 2f7b31222b1f44e13257eec2ba3645abb0d1ffb0 SHA-256: 05534e43ba55c74cc0063bc30dd562a67d685c784b222203e71b0d4a53276b9d
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, disguised as an answer key, which is a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent.

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://74-123-73-226.mgwnet.com/uploads/1/3/0/2/130287960/130287960.html#scholastic+success+with+reading+comprehension+grade+5+answer+key
    • http://nom-vula.com/uploads/1/3/0/5/130550938/wapepi.pdf
    • http://www.brendaforthearts.com/uploads/1/3/0/7/130740026/lavaxe-mogofapawe-noxisefa-filesaju.pdf
    • http://thecopywonder.com/uploads/1/3/0/7/130775422/e58289d833413.pdf
    • http://eatonshillrealestate.com/uploads/1/3/0/2/130289638/guporitujunixusow.pdf
    • http://buildingbrilliantmindsonline.net/uploads/1/3/0/6/130603767/bonawikirejebu-vaxepom-kitubamizonuj.pdf
    • http://gippopotam.site/uploads/1/3/0/6/130621223/tonanurose-jejezipigi-loguv.pdf
    • http://alexhowarthpt.com/uploads/1/3/0/6/130604529/6da22d497abc.pdf
    • http://eatonaroll.com/uploads/1/3/0/2/130287942/a0d21cba3669093.pdf
    • http://camargolegal.com/uploads/1/3/0/8/130814643/kolok-bubedaze-nojojiritowunal.pdf
    • http://www.solidrockhomecareassistance.com/uploads/1/3/0/8/130813667/8b9c36cd54b7372.pdf
    • http://cleaningstgeorge.com/uploads/1/3/0/5/130538946/badavigu.pdf
    • http://www.habitpost.com/uploads/1/3/0/3/130323161/sovesoxob.pdf
    • http://adventureswithrocks.com/uploads/1/3/0/6/130604315/1405073.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_off000052b5.bin
5f9d28d63d99bdae768b7f7375883c5cd8f94701c5ca985d5e8e50d51f18e724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B5 7184 bytes

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