Malicious PDF — malware analysis report

Static analysis result for SHA-256 6499e11bde131feb…

MALICIOUS

PDF

44.6 KB Created: 2020-03-23 17:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eae3bce78b79ea3038607ce24f0ef0af SHA-1: c3024bd555e214cae3f2bc7891fa311079179f82 SHA-256: 6499e11bde131feba51975dd6e0b6652558b49faa38675e7cd8f8cb0cad98a74
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier strongly indicated maliciousness. The embedded URLs are likely used to redirect users to malicious sites or to host further stages of an attack.

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://wordsmith-sg.com/uploads/1/3/0/4/130483924/130483924.html#hoteleria+sixto+baez+pdf
    • http://thehealthyurt.com/uploads/1/3/0/4/130483393/mejimatelirorir.pdf
    • http://ohitlooksgood.info/uploads/1/3/0/5/130540453/mikovubovab-mizigigu-wejek-bofelexajel.pdf
    • http://hostmaster.mini-office.be/uploads/1/3/0/5/130545334/00b849a7a.pdf
    • http://twooneninedesignsandart.com/uploads/1/3/0/5/130544043/popevufixikekopiliso.pdf
    • http://belkran-bk.com/uploads/1/3/0/4/130488362/0adefbee35210.pdf
    • http://alessertraveledroad.com/uploads/1/3/0/7/130776204/gaputuko_wezogibi.pdf
    • http://hallo-beauty.pl/uploads/1/3/0/7/130740320/gedezojevi-fotugojitixij-gebatorifup.pdf
    • http://seostuff.net/uploads/1/3/0/4/130483138/dbe859.pdf
    • http://yourhigherpower.org/uploads/1/3/0/6/130621245/0abe2f.pdf
    • http://handrail.systems/uploads/1/3/0/7/130740256/1070e5062b.pdf
    • http://greenmountainpropertygroupma.com/uploads/1/3/0/5/130588393/5848449.pdf
    • http://www.talandaspa.com/uploads/1/3/0/8/130873945/84517c1b8a5dfed.pdf
    • http://qisma-game.com/uploads/1/3/0/7/130738597/durazitodip-nuvutarodol-duwurunu.pdf
    • http://kimbery-barrett.com/uploads/1/3/0/2/130270889/bajuxitepij-rajono-vuwegoxub.pdf
    • http://sirinavideo.com/uploads/1/3/0/6/130621912/bivuregifidugot.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d16.bin
b3c837c313f183a3bf341e56d00971498cb368c2ec29747176debfae071ee3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D16 9612 bytes
font_01_sfnt_off00008f81.bin
98eae9b279df2ce680d70a4d505064ea756df0c3cbb9cd39c5dd401b12048d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F81 16184 bytes

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