Malicious PDF — malware analysis report

Static analysis result for SHA-256 61961e18c349ae0d…

MALICIOUS

PDF

95.2 KB Created: 2021-04-02 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b98939584c239c1d8d0185ffb1f55e1 SHA-1: dba71b618952225f86fde58253aae35072af0ae3 SHA-256: 61961e18c349ae0d5a17d4b5a26578faeb550c9d363e17d5c75d1f0ee97fec0c
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a 'blockchain tutorial' lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://nipisod.ru/award?keyword=blockchain+tutorialspoint+pdf
    • https://cdn.sqhk.co/molodomo/ZgijTid/today_s_date_in_excel_power_query.pdf
    • https://cdn.sqhk.co/kitujesijak/Snehgha/vamoxetikidasexugawuda.pdf
    • http://xexapitanegis.getenjoyment.net/median_gdp_per_capita_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gadumagabusodel/grief_and_sorrow_violin_sheet.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_264fa17d774b4ec9b53f647cc17c9508.pdf?index=true
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_5e17eaab4f8a4e04b092782c94c3975c.pdf?index=true
    • https://s3.amazonaws.com/vonuxagupeduze/juzevadidisopupidako.pdf
    • https://s3.amazonaws.com/waxegatulo/android_tv_netflix_vpn.pdf
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_f6c0fbbf41434be5afce778e473509a7.pdf?index=true
    • http://kabuzore.atwebpages.com/percy_jackson_series_disney_plus_teaser.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_86f4df9fdc9943cebe66fca22fee5ca0.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_c234f016a01c486abaa5e8f2eb600708.pdf?index=true
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_4b55e7a3f3974dcca4b7cfacacff0ff7.pdf?index=true
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_e59fb0204b854915b885817fd5752852.pdf?index=true
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_3fee48734f7f418594d2971afd8e432d.pdf?index=true
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_e7791673addc492e91e752e6c9161f13.pdf?index=true
    • https://s3.amazonaws.com/neporezofov/36596741231.pdf
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_12c46a025c15476981c12d9d3ffa510c.pdf?index=true
    • https://s3.amazonaws.com/gidibesuxi/bhai_behan_ka_raksha_bandhan_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a31.bin
aeb73afbee3bd46cff76f56175ac8e4a4afbf049f9e592699b5896cb458ce1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 5120 bytes
font_01_sfnt_off00013b7d.bin
9bef8366732042c35a5f5887a5c0d669e75f254ffe414044b025dd81b6f4f520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7D 10604 bytes
font_02_sfnt_off00015fd0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD0 4324 bytes

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