Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b607fc74078727f…

MALICIOUS

PDF

47.8 KB Created: 2020-03-21 15:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 93327f3d751d168ef06a3edbfe3e7ce6 SHA-1: a989336981e8e3ae44d32b3583ada9ea2684b27b SHA-256: 0b607fc74078727f010123db8b2753eb2171d85f1d96f3049bcebf40cae5ca7e
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a PDF link farm. The primary URL points to a page discussing Java programming, but the majority of the links are to other PDFs hosted on various domains. This suggests the document is likely used for SEO manipulation or to distribute further malicious content, rather than for its apparent content. No scripts were extracted, but the presence of numerous external links indicates a malicious intent to redirect users.

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://iglesiacentralfiladelphia.com/uploads/1/3/0/2/130289625/130289625.html#como+imprimir+un+arreglo+en+java+con+joptionpane
    • http://www.blackbushfarms.com/uploads/1/3/0/6/130603878/5059686.pdf
    • http://1800laserhair.com/uploads/1/3/0/6/130639061/bd0c794890e599f.pdf
    • http://gadaisa.net/uploads/1/3/0/2/130272442/2c3f6d8dbb.pdf
    • http://www.jsdrivein.com/uploads/1/3/0/9/130969373/nobatobatogeseg-jifukadazomulep-pamexi-sojexamigun.pdf
    • http://elizabethwinternd.com/uploads/1/3/0/6/130605048/6019818.pdf
    • http://tr.ncrage.com/uploads/1/3/0/5/130588222/vibukasebu.pdf
    • http://staringocd.org/uploads/1/3/0/4/130479123/nonudov.pdf
    • http://ftp.scheuring.ch/uploads/1/3/0/6/130639259/1255138.pdf
    • http://logisticsunitedinc.com/uploads/1/3/0/4/130435596/lefebedener-wezumasenita-kojupimo-jugilugokazu.pdf
    • http://www.visionpipetting.com/uploads/1/3/0/3/130323957/gexuxetukerokomedum.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e87.bin
e009f40f224f0cc6d326662b41faff2cae5180d1dd91dae346be23002115ba37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E87 9604 bytes
font_01_sfnt_off00009154.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9154 1708 bytes
font_02_sfnt_off000099bb.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BB 16312 bytes

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