Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb85217c835bc89a…

MALICIOUS

PDF

85.0 KB Created: 2021-03-22 15:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb03db1e63ec9bfbc955c39378f7868d SHA-1: c67ea261165d37067b347a603dcb391214043ba1 SHA-256: cb85217c835bc89aa5c54e77036e2962aa1ccbdd632d3dc24e2ea84d4c805f04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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/123?utm_term=chennai+gana++hd PDF link annotation
    • http://womenit.space/482074089948zsk8.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/airtel_tv_old_version.pdfIn PDF document text
    • http://otshelnik.net/ameline_eric_sammutzcily.pdfIn PDF document text
    • http://gagapazu.scienceontheweb.net/vajej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_601999546b226.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/dometic_rm1350_not_cooling.pdfIn PDF document text
    • http://usesoda.pro/22886916086ah2re.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/61767487638.pdfIn PDF document text
    • http://brumbum3.xyz/88146458551wyxr1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fd7b211b0e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_60468c62d43a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383149/normal_600878df4f3ab.pdfIn PDF document text
    • http://shoop-fm.ru/best_app_updater_apk3tlik.pdfIn PDF document text
    • http://yourcy.com/negenubbl5ew.pdfIn PDF document text
    • http://weridif.medianewsonline.com/the_pit_and_the_pendulum_assessment_answers.pdfIn PDF document text
    • http://azorocheat5.xyz/453580592537qnl5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_8c004a7203e7417c984dff3415057a28.pdf?index=trueIn PDF document text
    • http://seralugaba.epizy.com/47002559087.pdfIn PDF document text
    • http://simivejed.rf.gd/55434127885.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/antigona_rozbor.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_914079de369e42d6b8da79b108df7ca7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 4684 bytes
SHA-256: 24a5da7d9363f13a896f78586ad5767a9bd9466558fbb326c203087663439bcb
font_01_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 9224 bytes
SHA-256: 0da697fdd6aafe48a8895db5f7623bf5e6dbaabfbed5dd3be5acb2db7de1959b
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 2044 bytes
SHA-256: e8def34ef7fa1cd1e737aa53281a1ad4be732a20e453453846aa670fb207f4af
font_03_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10836 bytes
SHA-256: 16e4ebc47a2c4bbaad07446fe64de6a711fda39a05bdc0ea91c463c4f62bbbc0
font_04_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16544 bytes
SHA-256: 4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc