Malicious PDF — malware analysis report

Static analysis result for SHA-256 540b5ba52f72b6c6…

MALICIOUS

PDF

80.6 KB Created: 2021-04-23 06:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f253dad701a794c29dc43c956ce1d2d SHA-1: 11414b2b8faeda670b5f7663311c1f5a1f9838c5 SHA-256: 540b5ba52f72b6c6a269c752e2587095c96a0b881ae3443a554e3d0505db5c3d
156 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 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF documents. One of the primary external URIs, 'https://seumenha.ru/strik?utm_term=how+much+oil+does+a+2006+yamaha+r6+take', suggests a lure to a potentially malicious website. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+much+oil+does+a+2006+yamaha+r6+take
    • https://wopulatizu.weebly.com/uploads/1/3/4/3/134348797/1289975.pdf
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/videzaroxikozi.pdf
    • http://bufibinokurun.scienceontheweb.net/chuyn_sang_file_nh_trc_tuyn.pdf
    • https://static.s123-cdn-static.com/uploads/4418557/normal_6006a05584b69.pdf
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/fufox_zugepiwuboxuv.pdf
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5feb70c037a13.pdf
    • http://diporesorojina.scienceontheweb.net/90369124454.pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6048e48adc6d8.pdf
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fdb14334f9ec.pdf
    • http://gagimubu.mywebcommunity.org/vubapukade.pdf
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/wowor_vipax_nebuvelo.pdf
    • https://cdn-cms.f-static.net/uploads/4453134/normal_5fd77b3e8cffe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://refusunono.onlinewebshop.net/what_is_a_functional_life_skills_curriculum.pdf
    • https://s3.amazonaws.com/dakebesuvum/how_to_pass_your_permit_test_ct.pdf
    • http://bijipamowatu.epizy.com/barings_bank_collapse.pdf
    • https://s3.amazonaws.com/mizeteb/how_to_start_presentation_speech_sample.pdf
    • https://s3.amazonaws.com/memexelu/61944962543.pdf
    • https://s3.amazonaws.com/baxekojojexusol/second_grade_math_games_with_dice.pdf
    • https://s3.amazonaws.com/muvevanepen/six_of_crows_plot_summary.pdf
    • https://s3.amazonaws.com/wovitiku/formdata_append_json.pdf
    • https://s3.amazonaws.com/fapaga/internet_manager_for_mac_cracked.pdf
    • https://s3.amazonaws.com/nuselufuzo/investigative_report_template_free.pdf
    • http://lapobikajedive.rf.gd/mississippi_professional_drivers_manual.pdf
    • http://wuragumok.atwebpages.com/definition_of_anemia_in_pregnancy.pdf
    • http://wakefij.epizy.com/50914029502.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f989.bin
6769a097664d38640f30021cb7ea6e1400ccd4b894dac6b3f053628555f79ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 5828 bytes
font_01_sfnt_off00010d47.bin
659d534c4f3c6dfdac11e9cbca910c49d43263b5e52dc51d3a79b32700011cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 11512 bytes

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