Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6d60645305bf84…

MALICIOUS

PDF

80.2 KB Created: 2021-02-15 21:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5d3ff7dc45313062807ec0f080233463 SHA-1: 95810bc2cd27ee37877ff75facd70ecd12ab6df2 SHA-256: 4e6d60645305bf84b5c34c98631db851a6d446dd71499dbde71e80ccd94c270f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, and the presence of UTM parameters further supports a phishing or malicious redirection intent. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings strongly indicate malicious content within the PDF.

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://jottigo.ru/123?utm_term=what+is+tesla+model+3+track+mode PDF link annotation
    • http://yellownatural.space/brothers_in_arms_3_pcm74ii.pdfIn PDF document text
    • http://getbuiss.online/unit_1_dictionary_geometry_basics_worksheettjs2w.pdfIn PDF document text
    • http://itawegan.space/dungeons_and_dragons_5th_character_sheetdcuev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fff360f6ed18.pdfIn PDF document text
    • http://fortuneo.best/u_bolt_standard_metric_sizes4lai5.pdfIn PDF document text
    • http://lazerepil.site/89438240885i81hx.pdfIn PDF document text
    • http://update-win20.online/drowsy_chaperone_charactersnd726.pdfIn PDF document text
    • http://g2am2e.xyz/kodoxedurokukoxaluguvulbn992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_60242e1437dae.pdfIn PDF document text
    • http://soinjaga.ru/besupusowinumelitegatxgras.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6016f701cdfff.pdfIn PDF document text
    • http://xarusogu.22web.org/ranopeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xebudulo.rf.gd/maryland_motor_vehicle_accident_report_form.pdfIn PDF document text
    • http://ribikusilotagod.rf.gd/kawofegexujovesupejenow.pdfIn PDF document text
    • http://toviliguzufefiv.rf.gd/9723103590.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/belly_fat_diet_plan.pdfIn PDF document text
    • http://tinipukax.epizy.com/fipedivizexuliridefinodi.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/68331302888.pdfIn PDF document text
    • http://demunoj.epizy.com/brand_perceptual_map_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 5420 bytes
SHA-256: 505e2add3d3d6f7b8e09a5e32eee7daac0652dd8ce36aeca80a9479efcacc949
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10972 bytes
SHA-256: e974d487b007775530cc91e87397cd2b3b82f69d85383d9ba92cf9b1f924f7fd
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 17380 bytes
SHA-256: 33b90bbcff73dd6910ee4227553d1232aac8839fa0467d0b6e4d1c495f3c4171

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