Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fd1e003a645fdf…

MALICIOUS

PDF

73.9 KB Created: 2021-03-11 15:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2234ae9399c364a4a8fedf5ded7b055 SHA-1: 46da728b9e8880e20ba385f3b0f1a3c8ecd11b92 SHA-256: f3fd1e003a645fdf9cef0b0c00fa60938641b7cdae05e02bb650d933142f0c7f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicate a high probability of maliciousness. It contains an embedded URI pointing to 'gimoguvi.ru', which is likely a phishing or malware distribution site. The PDF's structure and embedded content suggest it is designed to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=dsm+iv+tr+casebook+pdf
    • https://static.s123-cdn-static.com/uploads/4426257/normal_600307d018080.pdf
    • https://static.s123-cdn-static.com/uploads/4411917/normal_60074637bd9aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65977748-5ecd-4a8d-bd72-096f23e6e799/malibu_low_voltage_transformer_200_watts.pdf
    • https://s3.amazonaws.com/woxewiwupir/css_grid_template_rows_auto.pdf
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_eb255523b79a462aad834bc0a1b999c6.pdf?index=true
    • http://valirakasudipo.epizy.com/67867387791.pdf
    • https://uploads.strikinglycdn.com/files/3deac1d0-e96e-445a-844c-3dbf0524b780/61519427643.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_ab213871204f4b5c930b3b9c4c83ed21.pdf?index=true
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_f021113e945541aa8a34c9e1fcd96654.pdf?index=true
    • http://guxozuzemonixe.epizy.com/bravecto_rebate_form_canada.pdf
    • https://s3.amazonaws.com/xukanomarexumu/nusigagopiruzo.pdf
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_8ddf57808f6844caab39a3384c47088d.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_1d7b2d4e789844769d805a1937d59ea3.pdf?index=true
    • http://dudulexo.epizy.com/20334215307.pdf
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_dc1a39984f21419880ae3508e4d2faec.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_eca6e400dcd843ef96d475938f81431c.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_4c8d0db6146d4419a60d234ecf6d86c5.pdf?index=true
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_2f7b956d064545cca3abe49fecad23c7.pdf?index=true
    • https://s3.amazonaws.com/dedinavesute/acme_gothic_font_free.pdf
    • https://s3.amazonaws.com/jiwisi/13044394024.pdf
    • http://zunaxixe.rf.gd/collage_photo_maker.pdf
    • https://s3.amazonaws.com/pipaneku/graduation_gown_measurements_guide.pdf
    • https://uploads.strikinglycdn.com/files/a73a5b2b-7bc0-4876-a45d-b75a7c202b2e/international_journal_of_research_in_medical_sciences.pdf
    • http://pimibini.epizy.com/sulilafelogowidazozasiv.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d055.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 6744 bytes
font_01_sfnt_off0000e13c.bin
4811ce8dae9c732ed0c2f70c61ea6054bbbbc853ac7a2e4ab229cf4b5eb46fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 5532 bytes
font_02_sfnt_off0000f400.bin
2977f2de59dff3e13fe60fca7a868f45bc3d19a31391314be67fc073835cbbe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10756 bytes

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