Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e66438a8c55058d…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 07:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce230d944fea9d0cb856e4ae35283ef2 SHA-1: b16830a085d28a5055c4669138d7911cdfbcf72a SHA-256: 2e66438a8c55058dc8682df7635ef6c6e72cc9dde1683fedbf13f5ec4652e773
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a common phishing or malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=application+security+in+cloud+computing+pdf PDF link annotation
    • http://hookup157.site/441149817347r9uq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_604f4edc0babc.pdfIn PDF document text
    • http://distornyup.site/rulizenotejowejabewamuturpavn.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/Hgdwfih/43519268492.pdfIn PDF document text
    • http://femesugubu.iblogger.org/the_strangest_secret_nightingale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_6034836b4a1ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_600fbfcb49415.pdfIn PDF document text
    • http://bukogibewidigu.iblogger.org/pastoral_care.pdfIn PDF document text
    • https://cdn.sqhk.co/wojeberupe/sMiiagh/nevawubuwofote.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/ghih9ie/bt_group_plc_stock_transfer_form.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/hczhchb/city_racing_3d_game_download.pdfIn PDF document text
    • http://umkatrade.ru/39773155189d37sz.pdfIn PDF document text
    • http://bet-info.ru/ponazofekifuvuxedasofaxipzifvv.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/gcChhiv/bounce_jumper_edm_rush_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6029797ae8cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_6031631072ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugifub.epizy.com/malidaxowuladajumone.pdfIn PDF document text
    • http://jexusapije.epizy.com/ladomaxaxofiver.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_ca46ad03534c4d028156c31e7393b0e1.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_b480394211ee46f2b5ce094a56585941.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_1080330257f74d63a0fe317a1872d02e.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_650eedbe19b943f19489df38fefee8df.pdf?index=trueIn PDF document text
    • http://fanuzisi.epizy.com/element_compound_and_mixture_worksheet_answer_key.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_1c82d8f1242e4491bbb486a880023415.pdf?index=trueIn 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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5564 bytes
SHA-256: 3c49b44863121eae39a71c1e97cafc138f19b72d5faa2e6ee020d80f58a4910b
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 11316 bytes
SHA-256: 4ec21d22900f8817c257e6a9464c8d502ead3027b034b2c1bc28c567cb9ff419

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