Malicious PDF — malware analysis report

Static analysis result for SHA-256 6074eefdc740141c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 16:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac5001bea7231fd3bc3601261d76acca SHA-1: d0aa2c7f79f7c793eed1dfa450591cd86f9c3b2f SHA-256: 6074eefdc740141cb4e7aa707bf1e5291f3a3f8ae9f15de3b2a61a4ee4d8edc7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or phishing attempt. The primary URL, 'https://pelibifir.ru/wix?keyword=crayfish+dissection+lab+report+30a+answers', suggests a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its phishing and potential trojan delivery characteristics.

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-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://pelibifir.ru/wix?keyword=crayfish+dissection+lab+report+30a+answers
    • https://cdn.sqhk.co/vinikawikuve/x8ififE/battlelore_command_apk_obb.pdf
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd7f2d7e2d64.pdf
    • https://static.s123-cdn-static.com/uploads/4444884/normal_5fe267958bbe6.pdf
    • https://static.s123-cdn-static.com/uploads/4486193/normal_5fe5d4299d492.pdf
    • https://cdn-cms.f-static.net/uploads/4414153/normal_60525cb12b9f2.pdf
    • https://cdn.sqhk.co/basinasedu/okTji9k/gugoxotad.pdf
    • https://cdn.sqhk.co/zalivelo/fnjbzjd/vomukuwagikabuvajorizose.pdf
    • https://cdn.sqhk.co/dumadomizore/MrGgjpV/pajubofonav.pdf
    • https://cdn.sqhk.co/tokebamojos/giic3gg/wallpaper_hd_4k_backgrounds_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4388818/normal_6023a21168d78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sepovutapakogaf/fakujifufob.pdf
    • https://s3.amazonaws.com/jukezeluf/semetenisugatoj.pdf
    • https://s3.amazonaws.com/biwubeleba/lake_guntersville_fishing_report_march.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_4b38704fa7c946dc978e3db1c9365ae9.pdf?index=true
    • https://s3.amazonaws.com/jujojomojemiz/digital_electronics_projects_for_beginners.pdf
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_12a53bfb8fe0459a9fc6596b88813f2a.pdf?index=true
    • https://s3.amazonaws.com/vinivuxo/kavob.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_949b7d2069974078bafc1fa2f36ab9e7.pdf?index=true
    • https://s3.amazonaws.com/bubeto/riliwikelafogakagasobok.pdf
    • https://s3.amazonaws.com/zazelujeju/king_richard_iii_famous_quotes.pdf
    • https://s3.amazonaws.com/bifamomove/yandere_android_21_x_male_reader_wattpad.pdf
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_b828acfbae3844dda05f7b8e970c071f.pdf?index=true
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_625fb47d3fed4b07b33a9b3c6faff911.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_db5face8767b461fbc8af5a767981673.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a7.bin
8035c86fa5f1c3c88c3d64d6ea48b4d4a8a4c7b19e70fc7ed33202c84d119350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5788 bytes
font_01_sfnt_off00010766.bin
983b5f2841b8bdfaa1c5e4ef62778b0138afa32ab7f3ec42d78503814ced49a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10532 bytes

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