Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd720a20759d9a6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 15:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83291ab228db30ed33089a9b0c63c14 SHA-1: 244e66337ab54da3dba99a9bb91ec07605b3a406 SHA-256: 0cd720a20759d9a6912e8df129e9ff0c2f78a975db48a0f764102f0d8c8d90fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=upsc+sociology+optional+syllabus+pdf+download
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/fikejapafe.pdf
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/bevebanago_lorefikozaruk_razibodu.pdf
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/4436163.pdf
    • http://wusator.mygamesonline.org/9_11_zoom_background.pdf
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/6b5562a32b0.pdf
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/kosok_sonavijex_pikevumiso.pdf
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/20af07271b6.pdf
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/2039380.pdf
    • http://wivuperafuzo.mypressonline.com/vulvovaginitis_adalah.pdf
    • http://fofiwafajelerax.sportsontheweb.net/what_is_cultural_landscape_examples.pdf
    • http://nigoguno.scienceontheweb.net/briggs_and_stratton_500_series_manual.pdf
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/vekaxisaradelo-mazago.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vawoginele/cartoon_love_wallpaper_free.pdf
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_2be8977a9d5d4ba59ed7576ea0157700.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_df1d39a0605341e99748b9a1904636cc.pdf?index=true
    • http://zutugidod.onlinewebshop.net/camilo_jose_cela_biografia.pdf
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_58ba720dcd384b329cdbd20c6748d283.pdf?index=true
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_d0d09636337644aeb33658565d3e0b0d.pdf?index=true
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_0f3f81b639e248aeb6998a12a4f62d04.pdf?index=true
    • https://s3.amazonaws.com/pewebopufupe/totozapaxapawigeligebufi.pdf
    • http://nibubatovavav.atwebpages.com/analogical_thinking.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin
48a82d4fd3e5890b1097f6860bd0fb4af3a06d3a799c979364e0abd80e3c85db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 5552 bytes
font_01_sfnt_off000107ac.bin
638f9825310aaf2d09a7641eedb0c3b5122be6b321383d50f2f734ab96ff35eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10804 bytes

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