Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f5fd6853f95a0b…

MALICIOUS

PDF

81.0 KB Created: 2021-05-09 22:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 745eeca880d9fe00dd372bc923f755b2 SHA-1: 7c82abe8118757533727b5032aeb4463d8f623ff SHA-256: 64f5fd6853f95a0b3141e9fe85477d86266c5a6560de79a664d6d34b76acccda
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and the ClamAV detection as Pdf.Phishing.Trojan further support a malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://xezojetit.ru/strik?utm_term=reaccion+de+combustion+completa+del+pentano
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/pikagogeb.pdf
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fed149ca0ccc.pdf
    • http://kikifikoxije.mypressonline.com/veledenebexudedelukixem.pdf
    • https://cdn-cms.f-static.net/uploads/4460457/normal_60501b4ec1950.pdf
    • https://tubivafidet.weebly.com/uploads/1/3/4/8/134886435/sizituzedukomif.pdf
    • http://lemafesopeposuz.mywebcommunity.org/technical_analysis_candlestick_patterns.pdf
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/2ddd5.pdf
    • http://xofofumireke.mypressonline.com/what_can_i_make_with_an_air_fryer.pdf
    • https://xamuzufoka.weebly.com/uploads/1/3/4/8/134893590/pomajew-kenometetijaze.pdf
    • https://cdn-cms.f-static.net/uploads/4452618/normal_6028392b0c6ff.pdf
    • http://zugapuvu.mywebcommunity.org/variedades_linguisticas_del_castellano.pdf
    • http://nexofozupugasi.mywebcommunity.org/que_formas_de_expresin_oral_existen.pdf
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ffe62e5e15cb.pdf
    • https://cdn-cms.f-static.net/uploads/4490252/normal_603388f4c3cdc.pdf
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/demetinudizi-zekusu-zofinakime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_99e87e376e434156b2db2dd2970ddedf.pdf?index=true
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_0bec7f04bd0d4443855dcd7dbec56cd0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc243b36-b5d6-43b8-8aec-d6b399086644/58154707378.pdf
    • https://uploads.strikinglycdn.com/files/197bcc23-8837-4b1c-a6b9-152b4de6d1a4/tenancy_agreement_termination_clause_sample.pdf
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_dba16bf980354c7b9df3622785de8adc.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_d3b21888c5e945288170816db6330875.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e904dabc-c61c-4959-bc6b-811cc50b83d6/9466151576.pdf
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_21533019a9c7442c9c7094f707eddedd.pdf?index=true
    • 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://scripts.sil.org/OFL
    • 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_off0000e14c.bin
a36fb1cf128b7bbaf79809e04316f1f591ac01d94c67f6b0fd5df5f14426e718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 5272 bytes
font_01_sfnt_off0000f325.bin
76610b4bf01cba34acf81db9f2b6584c1fd8c1e872c59beaa49950745a1f83f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 12948 bytes
font_02_sfnt_off00011dec.bin
2de5fdd2f3efa29fb386cbab47db21d431fa4e0cfab56720b016f6f3c8448392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 16304 bytes

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