Malicious PDF — malware analysis report

Static analysis result for SHA-256 db791a9b1dbdd003…

MALICIOUS

PDF

85.8 KB Created: 2021-03-21 01:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78bb22bde1dd269230163871618d8250 SHA-1: e936e94fc460cc49a4e2e88f747199def07e8d1b SHA-256: db791a9b1dbdd003e184aa43ced7041b59c861159ba05640baa3adc9f71882a9
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 0.9998

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://midufefew.ru/123?utm_term=cg+navratri+song+free PDF link annotation
    • http://english-10.site/on_the_banks_of_plum_creek_free_audiobook9mj99.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/wesopa.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/egcic4e/run_santa_run_merry_christmas_2019.pdfIn PDF document text
    • http://perevod24-card2card.site/cyberpunk_2077_reddit_config_fileszqfn.pdfIn PDF document text
    • http://naturebiolog.fun/54868982455offc7.pdfIn PDF document text
    • http://boldly-grow.com/14369305606wpm1w.pdfIn PDF document text
    • http://toportt.online/3879516499lmj37.pdfIn PDF document text
    • http://topcreditmonitoring.info/436366313688cza3.pdfIn PDF document text
    • https://cdn.sqhk.co/miwurazaz/jcjfieX/scatter_plot_worksheet_grade_6.pdfIn PDF document text
    • http://ukrinsure.com/dd_free_booksa29xm.pdfIn PDF document text
    • https://cdn.sqhk.co/jexerigix/Bk5TihI/stock_trading_simulation_software_free_download.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/lorawibozekubalu2kkti.pdfIn PDF document text
    • http://supernefritroller.xyz/11647570454wwp4f.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/luxinobovelanevekemaxogi.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
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_1827e32efc88474ca5667da49f6ebeca.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_846dad8460b54d318451bd2dafe1d558.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_604d3791e11947548cc8cf6d5236ff41.pdf?index=trueIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/jamesitowezuzo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 4776 bytes
SHA-256: 004a8b6f7692c217c3d63b156fbc0ad5411fb0fdc6848d493ff83b09673e82cf
font_01_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 10576 bytes
SHA-256: 1d99170656d82a898f488306e31dd3ca71765feca32b927b44635ebc979e8fcf
font_02_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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