Malicious PDF — malware analysis report

Static analysis result for SHA-256 615a6db644f05158…

MALICIOUS

PDF

77.6 KB Created: 2021-03-05 09:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bb1011fc339b679b539ae3c864afca2a SHA-1: 52353c401b484bde7fbd4b0f2bd844a338f0c9b3 SHA-256: 615a6db644f05158ffb74c7d294e5264d07330296b3ed89eb302e39562aba571
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically directing to a suspicious domain ('mezovuduw.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8240

Heuristics 4

  • 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
  • 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://mezovuduw.ru/award?keyword=what+are+all+the+ranks+in+the+us+army PDF link annotation
    • https://cdn.sqhk.co/moxinivo/dhilyTD/fiwalizedogozomid.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/aAKieFY/55157320753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_603bd36752251.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/50947292045.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/jfwZk12/93787713821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_602c47448aff6.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/aUibgjH/ruropejoziputoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fd2dc6a56a3a.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/how_to_clean_a_5hp_briggs_and_stratton_carburetor.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/determine_quadratic_function_from_table_of_values.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/kokadumuv.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/padenegor.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/vezosetojivefepumuxidifuz.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/jehfghi/fried_chicken_running_gif.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/how_to_repair_washing_machine_that_wont_spin.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/K3ahhIW/hearthstone_battlegrounds_strategy_elementals.pdfIn PDF document text
    • https://cdn.sqhk.co/rubalibuzodi/jj5Eidr/eye_color_change_software_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/ihibgic/1996_geo_tracker_speedometer_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ihhXiaT/77493323321.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/41301688316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezamax.myartsonline.com/lizuxolapivetana.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/kofapokofevubiroxe.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/63297599827.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/59498253706.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/dragon_mania_legends_breeding_guide_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/62483280395.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 5104 bytes
SHA-256: c077aa440613c48d196411ba6e194a945fbefb3ec8e96104921daea5ed2a8ec3

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