Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4a1adfa14f0e05…

MALICIOUS

PDF

91.4 KB Created: 2021-02-24 18:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ad52674ae870d94773dfe0f1e21e75e SHA-1: c4e004f79d4d3a9f82db01269916e96e522d9481 SHA-256: 1b4a1adfa14f0e050e5970cbfbaa90b48eb60985fcfdb6d429bdc701b6c3de0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=precalculus+with+limits+answers+chapter+1 PDF link annotation
    • http://rugegav.mywebcommunity.org/fallout_4_mods_without_bethesda_account.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd1601fe7976.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/kujeso.pdfIn PDF document text
    • http://nukobom.22web.org/bomb_blast_sound_effects_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/8rihzxg/thief_master_phone_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xizilagitakov.epizy.com/9422761183.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/arachnoid_chiari_malformation.pdfIn PDF document text
    • http://ramasewo.epizy.com/adobe_photoshop_lightroom_6._14.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/hillocks_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/zavekinananibuboganatiru.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/febatidokelug.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 5092 bytes
SHA-256: e3307bdfadff9bb9960cdc5aedb697ab190bf0ad1b2380823ae6538ad06ac0c8
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 11608 bytes
SHA-256: c28b6d897225b81337e5f6e123cf69827e5b3bd1a4fa9547d71b257cfcc95edd
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 16236 bytes
SHA-256: 634450e6c4e52b226b0bef7cadc84c69f1de6af9e70199405b175d36d7cac029
font_03_sfnt_off000151d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34