Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbb08ca2e3647db…

MALICIOUS

PDF

73.0 KB Created: 2021-03-07 05:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a4a78e3353307c57abd45934e9da170b SHA-1: c585ddf14c37868d7ad542747173ff2fef21381c SHA-256: 9cbb08ca2e3647dbf6e078fb50445172c0c77d4468ff111b718509aa0b3a2b32
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or a mechanism to distribute further malicious content. One of the extracted URLs, 'https://maypoin.ru/strik?utm_term=brother+mfc+490cw', is flagged as unknown and is likely part of the malicious infrastructure. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=brother+mfc+490cw PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393359/normal_5fec26b836567.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/65711622636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_600f1217894ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe118bb79008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601f9f8139f13.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/tomumugivogilal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fcdace539f22.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/197cdd53646a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379034/normal_5ff9e16998c26.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/a315fc537e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455884/normal_6008db503356f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rumezo/bahubali_movie_hd_video_song_free.pdfIn PDF document text
    • http://doxokalisawe.myartsonline.com/ipega_controller_android_games.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/bokexatafujadupuvelizi.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/milk_adulteration_test_procedure.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_3bf04e6d7507460397f57a216cbacc27.pdf?index=trueIn PDF document text
    • https://60bf9f63-c9a1-408e-a1ad-d98398230301.filesusr.com/ugd/a07927_e1a635f9688243cd99e0882373021792.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_70e8e237975542d689d9fc95519aa5eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/pwc_india_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/best_boxing_videos_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5228 bytes
SHA-256: 359177996484dce1fa1f8f97e3ecdc002f1a8997da6dae421706cfd4e851bb61
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 11248 bytes
SHA-256: d47ee7e08990cb2441175e05bd370fffde5a845bd9f38741612f26a1cdeb2a30

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