Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccb6a3de0c7ba38…

MALICIOUS

PDF

50.3 KB Created: 2020-03-30 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 743ab929e9f17e8d156756a2e5a7ce54 SHA-1: f60af81a31fb625557ab5274be8f86e1166b16b9 SHA-256: 6ccb6a3de0c7ba38c910a0a92086713a9d894aab0dfdaf8ba6f9282fd25f8e8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links to other PDF files hosted on various domains. This technique is often used for SEO manipulation or to distribute a large volume of content, potentially malicious. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://eshibofengyunzuqiu.br3h.com/uploads/1/3/0/9/130969999/130969999.html#verbo+to+be+en+espa%C3%B1ol+y+en+ingl%C3%A9s
    • http://renewals.doubledutch.me/uploads/1/3/1/4/131454580/xogupufurag.pdf
    • http://zilkerpharm.com/uploads/1/3/0/4/130436282/sadomasesod.pdf
    • http://thefabricmermaid.com/uploads/1/3/0/7/130776241/fofusutino.pdf
    • http://mmcarterconsult.com/uploads/1/3/0/5/130588430/6667705.pdf
    • http://josecortez80.com/uploads/1/3/1/4/131437107/d3002faaad7024.pdf
    • http://chefbar.com/uploads/1/3/0/5/130590717/nutonapurilulufax.pdf
    • http://rockbalancemeditation.com/uploads/1/3/0/4/130488470/709a516db06e.pdf
    • http://altitudeindustries.net/uploads/1/3/0/8/130873922/segaziwiki.pdf
    • http://mailbear.org/uploads/1/3/0/4/130489102/tedadarosipose_vusafakijowugu_ferigivanato.pdf
    • http://lovelytreats.net/uploads/1/3/0/5/130551219/def61b580b1adb.pdf
    • http://tiffanynewman.net/uploads/1/3/0/6/130639980/jijowovelati.pdf
    • http://transformologywithhelen.com/uploads/1/3/0/5/130590297/27a8592ff9a02.pdf
    • http://topshomeinspection.com/uploads/1/3/0/6/130604956/4158289.pdf
    • http://tristarlogos.com/uploads/1/3/0/9/130969139/tulowudi.pdf
    • http://themissymoreno.com/uploads/1/3/0/5/130588913/3669279.pdf
    • http://beantowncarolers.com/uploads/1/3/0/8/130874156/tiginejirufino.pdf
    • http://androoms.net/uploads/1/3/0/9/130969795/sajadiwanixurujixu.pdf
    • http://sprzataniewspolnot-warszawa.pl/uploads/1/3/1/1/131164475/lodukijulino.pdf
    • http://mohammedalraisart.com/uploads/1/3/0/6/130622023/1784726.pdf
    • http://evindalepins.com/uploads/1/3/1/4/131438539/7890812.pdf
    • http://investorsmarketresearch.com/uploads/1/3/0/6/130639808/tigawogapanomomi.pdf
    • http://emeryplumbing.com/uploads/1/3/0/5/130542770/geporuxim_nexipi_pilete_rekik.pdf
    • http://lobare.com/uploads/1/3/0/6/130620685/bufima_diluvabolewe.pdf
    • http://customartstores.com/uploads/1/3/0/6/130605222/kulizuvunafesov.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • 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_off00007857.bin
169f5a0109ec8f86fcb5c314a0a0ffde44efed03a8fd04b74ca2ede25c10e437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7857 9408 bytes
font_01_sfnt_off00009a64.bin
d0ee21efe1ed539e06d2acc91ce4f0a0bb548c180d0a7caa40693e70892b421e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A64 2600 bytes
font_02_sfnt_off0000a391.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA391 16036 bytes

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