Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a45c06f9083de5…

MALICIOUS

PDF

71.8 KB Created: 2021-04-04 09:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49569866648508a21784a8d8ac37fbc1 SHA-1: d5026464a16264fdf1a5590673acc568580b25bc SHA-256: 87a45c06f9083de52d9323845d91696d1a83deab0c581dc9153703a741b6e117
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 to SEO-optimized PDF hosting sites, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious campaign, likely involving a phishing lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=jin+zhang+uc+davis
    • https://cdn.sqhk.co/jumifokujuje/jwhagjh/homeschooling_free_resources_uk.pdf
    • https://cdn.sqhk.co/zetoxezoza/ax72dUz/avast_free_antivirus_games.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_60113554be494.pdf
    • https://cdn.sqhk.co/lonuxonemor/C1wghjW/new_bridal_hairstyles.pdf
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5ff90941a50a5.pdf
    • https://cdn.sqhk.co/ruzudulo/hegf3id/be_the_king_judge_destiny_wiki.pdf
    • https://cdn.sqhk.co/madufuxenuw/YCTgjje/3316911179.pdf
    • https://cdn.sqhk.co/rumomezojeku/8ajmfgh/sql_format_decimal_as_currency.pdf
    • https://cdn.sqhk.co/vovawumusa/egKRHE0/73313976291.pdf
    • https://cdn-cms.f-static.net/uploads/4366340/normal_6049315e11d74.pdf
    • https://cdn.sqhk.co/lofujumixas/jjHgcic/addon_mutant_creatures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lerezazo/what_is_peak_vertical_ground_reaction_force.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_c36634c5f90b45eda7a4f955999477db.pdf?index=true
    • https://s3.amazonaws.com/fapaga/bits_to_bytes_conversion.pdf
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_7b94773f77ca4c87b2e7ac4809882d82.pdf?index=true
    • https://s3.amazonaws.com/rujimidujek/31646563938.pdf
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_86f18ab102c44f0ca07da8dfdd365603.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/sum_column_google_sheets.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_d8e408dd3a9a44609e2c2074ba9c363d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfcc.bin
634d14fc490a2f6392dfd75f2a4ddcf671845c6fc53f08b369cdc035ee4c1544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 4748 bytes
font_01_sfnt_off0000dfda.bin
2eeeb85e6862e5e4d523282958b20958d63670c68f5c68f90c7ff5687e16389d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10740 bytes
font_02_sfnt_off00010485.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 4324 bytes

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