Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478f223ec40b997…

MALICIOUS

PDF

73.7 KB Created: 2021-03-31 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6e38575a8bc85161e5df6380f0691081 SHA-1: 10cc2c1b5f5438b7d6379749396e6b0c1dbe5cb3 SHA-256: a478f223ec40b997ee5c5ac3b6c2c8a3399f93467a7d0433f6d2786bd225ec68
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-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://golowaki.ru/123?utm_term=rascals+movie+video+song+hd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5ff90e4765c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_603aa1ba86247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_60359d7091f30.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/panasonic_kx-t7731_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fdc26ff95c12.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/8623497.pdfIn PDF document text
    • http://dapujabowigu.sportsontheweb.net/23298775909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_6035f75b2bb85.pdfIn PDF document text
    • http://titalat.iblogger.org/61931335742.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/vewujagem-famaritalobub.pdfIn PDF document text
    • https://miwomineferele.weebly.com/uploads/1/3/4/5/134514444/3100062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimitafukufes.rf.gd/apparel_industry.pdfIn PDF document text
    • http://zufakugofozufi.epizy.com/mirulafizitixuxi.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_24731278e1304e6a9f99dc7141b4c9a5.pdf?index=trueIn PDF document text
    • http://lofowopajuror.rf.gd/stop_bang_sleep_apnea_questionnaire.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/livre_de_communication_d_entreprise.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_d9b090803eb84dd5981801f64209fe3d.pdf?index=trueIn PDF document text
    • http://dupodege.rf.gd/pitney_bowes_franking_machine_will_not_print.pdfIn PDF document text
    • http://witigunakejawi.rf.gd/zopokufolopes.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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 5324 bytes
SHA-256: c823cfb50fdad63dcc70e5975e476658d00b8da781a1e7997251611f07742b4a
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10828 bytes
SHA-256: 4c94c06c8900f732cdd371d96dafe290dab4d12e39db8d2c04aecfa7bbd2002d