Malicious PDF — malware analysis report

Static analysis result for SHA-256 1229634da59d698a…

MALICIOUS

PDF

84.7 KB Created: 2021-04-01 14:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e29873158e1c55dcc900b11162bdd885 SHA-1: 279b0405efbe935598dd9f9a9b79d48b10753b95 SHA-256: 1229634da59d698aec6e89055367ba830386068d8bd4e43a7e22e4e26db892cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=square+d+pressure+switch+9013fsg2m1 PDF link annotation
    • https://xejuzofuna.weebly.com/uploads/1/3/4/8/134858051/9524870.pdfIn PDF document text
    • http://wobepatonogez.iblogger.org/cisco_anyconnect_4._5_mac_os.pdfIn PDF document text
    • http://kokogasuwesoge.22web.org/cover_letter_sheet_metal_worker.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/ketapalotax-fitobotesakilub.pdfIn PDF document text
    • http://xuzoxozi.22web.org/kebawitijezenupujejug.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/vhDhaxo/hubelino_marble_run_instructions.pdfIn PDF document text
    • https://defusisiz.weebly.com/uploads/1/3/4/5/134599350/3182042.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/dorafuwagegi.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/VsZighh/whatsapp_gb_app_apkpure.pdfIn PDF document text
    • https://saxurugilura.weebly.com/uploads/1/3/2/8/132814125/5892315.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/ggrrbMb/sezedi.pdfIn PDF document text
    • http://pidawiwosoda.iblogger.org/plastic_sheeting_vapor_barrier_crawl_space.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/idWgggi/rivudaluridisetexajotulav.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/61a93.pdfIn PDF document text
    • http://jawogili.22web.org/37460416792.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/1811652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dutowatakeviw.epizy.com/10663663124.pdfIn PDF document text
    • http://nedomovoguluz.rf.gd/sexipujafosozemizix.pdfIn PDF document text
    • http://bawujirilo.epizy.com/75424535489.pdfIn PDF document text
    • http://vunatilun.epizy.com/48999028201.pdfIn PDF document text
    • http://wegoxoxajenugol.rf.gd/niwazubo.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 6504 bytes
SHA-256: eff2edec2806cd2dc542b0a073d4e9b6dd5d7e02a0805dce433f218c40a0216f
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 11024 bytes
SHA-256: 2ab75ae1340eaa1204facf2f1e67481dadc74c5d384b0530171e81d3b64c99cc
font_02_sfnt_off00012e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c