Malicious PDF — malware analysis report

Static analysis result for SHA-256 11652c5434c936e9…

MALICIOUS

PDF

73.0 KB Created: 2021-05-07 18:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 048154f686801401302b12d7289d5052 SHA-1: 9c756a28269205aaf09b21edaee58c125ef29a82 SHA-256: 11652c5434c936e9d560f02128cd2af51baa4b5f230d6f22d0b849406940e73b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of many external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=2012+chevy+silverado+lt+crew+cab+for+sale PDF link annotation
    • http://letaraluzim.scienceontheweb.net/babokalibatejedewelizix.pdfIn PDF document text
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/pamud.pdfIn PDF document text
    • https://nibasekugi.weebly.com/uploads/1/3/1/0/131070633/modadalunepenon.pdfIn PDF document text
    • http://xenojupu.mywebcommunity.org/7th_grade_math_worksheets.pdfIn PDF document text
    • http://eferevole.com/38414373461f4cfq.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/19f49.pdfIn PDF document text
    • http://storezone.info/laxixanadabuxu0i5go.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/the_abominations_of_yondo.pdfIn PDF document text
    • http://myimperfectmomlife.com/scratch_2_tutorial_for_beginnersq4wdo.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/tijavuxi_zoxomepul_lezikamekomiwo_nabafalexugek.pdfIn PDF document text
    • http://formulamoney.top/walmart_pharmacy_phone_number_mesa_arizonabb9qp.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/kasuwugusenekujufos.pdfIn PDF document text
    • http://regse.website/37810502989nn9e7.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/2539839.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/aprender_ingles_facil_para_nios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setewexevevel.epizy.com/bronto_platform_saddle_cheat.pdfIn PDF document text
    • http://xerobesufeworep.rf.gd/35913428112.pdfIn PDF document text
    • http://baxewape.myartsonline.com/mefatosasotasipadu.pdfIn PDF document text
    • http://poruworetizilu.epizy.com/what_does_the_mandalorian_say.pdfIn PDF document text
    • http://junamatodomuwip.rf.gd/13096359278.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 5736 bytes
SHA-256: db04594487c96476a504fd44ba0c5ee59cd69d0b3d6ae0b9be1a68b54b19e417
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10544 bytes
SHA-256: 7d7d6d5922ee3deb957ddaadc00ff0334e27f64d4748b0a93a2acc64ad6637b1

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