Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5aeb1bdbca6843…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 00:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e4856c44e89d4cbd2b7a46b5bffff369 SHA-1: d0a64ede190b70693eadb24d5d8d01c82dbc1850 SHA-256: cb5aeb1bdbca68432bee75e0df55b110818a703be15f5901bc730f68108a2e65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to `zajinet.ru`. This URL is part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=tanki+online+test+server+commands+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480886/normal_606a5573e840a.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/bulezijiwowi.pdfIn PDF document text
    • https://nixixope.weebly.com/uploads/1/3/0/8/130874324/2855196.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/1012357.pdfIn PDF document text
    • http://rodina38.ru/delta_monitor_1700_shower_valve_repair7lpj0.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/49667db719e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6040f1b06b226.pdfIn PDF document text
    • https://monotolifevi.weebly.com/uploads/1/3/4/6/134683372/pimosexaridos.pdfIn PDF document text
    • http://lifeit.pro/98521120457sawe4.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/togirevig_kepige_venewawanuben_vejuvipuwomov.pdfIn PDF document text
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/miguvoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_60678cafa7ebd.pdfIn PDF document text
    • http://kindraretterath.com/dd-wrt_operating_mode_gateway_or_routerp6r6j.pdfIn PDF document text
    • https://lipulutopokun.weebly.com/uploads/1/3/5/9/135964399/61f6b8694f.pdfIn PDF document text
    • http://demask.fun/extra_attic_self_storage_tryon_rd_raleigh_ncdeyvp.pdfIn PDF document text
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/nezotubidil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/vigagalenekebuwijevam.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/los_caminantes_mix_rancheras_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/highlights_hidden_pictures_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/facilitators_guide_to_resilience.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/xilisi.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/pictures_of_the_bethlehem_star_december_21st_2020.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_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 5432 bytes
SHA-256: 39dcbe877b229aa32b3dfce0c50838a861ec23c0a8087fbd81b01f215b664b02
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 11088 bytes
SHA-256: 5ac2d1adb6372cd1ca2fc798788ad9b5620f0bc330c17346940dcef45b12c1ec

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