Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dcb7be99f27440…

MALICIOUS

PDF

97.4 KB Created: 2021-04-25 21:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1a28a8290806469c8b3cae71b89106f6 SHA-1: f7a41b53ef39fb0d4746e7b52eec3b6c2b74267e SHA-256: 82dcb7be99f27440d6ee10950fd3e1af51d53cf90b810a197d351152d695bab7
134 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection. It contains numerous embedded URLs, with at least one, 'https://jacksth.ru/strik?utm_term=crosman+mod.+1077+co2+gewehr', being flagged as a potential redirector. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure on disposable hosting, suggesting an attempt to obscure the final destination. The SE_INVOICE_LURE heuristic further suggests a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/strik?utm_term=crosman+mod.+1077+co2+gewehr PDF link annotation
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/xedabapazugeg.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/fowutenadajujis4tj3.pdfIn PDF document text
    • http://lasinonid.iblogger.org/32465416960.pdfIn PDF document text
    • http://leqqurint.online/122374046496e183.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/sozudukomopipi.pdfIn PDF document text
    • http://instapriz.site/413957166271ylnt.pdfIn PDF document text
    • http://onlinetiser.website/towonuzovajosepux3dp.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/renik.pdfIn PDF document text
    • http://fejoromawefobo.22web.org/aquilino_ribeiro.pdfIn PDF document text
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/3496999.pdfIn PDF document text
    • http://libralab.digital/this_modern_love_bloc_party_traducidas7dgh.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/nowitu_zewejaguxanaz_banego_rulinik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b8fc7a-8e53-464d-b92c-7fcc5c2f0536/warhammer_40k_novels_to_read.pdfIn PDF document text
    • http://babupit.epizy.com/47034500838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0d79df-e584-4c49-b160-402eb956a6cb/76458207758.pdfIn PDF document text
    • http://fozilixugijuva.epizy.com/63052141063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8b7293-a477-44f1-9faa-27566ecb9b16/75730042782.pdfIn PDF document text
    • http://diduzivil.epizy.com/financial_reporting_hotel_industry.pdfIn PDF document text
    • http://nimobavaze.epizy.com/nidalefu.pdfIn PDF document text
    • http://kivosokefenugez.epizy.com/clinical_pharmacology_definition_in_medical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e94e56c-58c5-4763-9c1b-5fc58249f2d7/what_is_the_navy_seal_training_program.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_616b27a23b4149a6982f27cdb58a3ea0.pdf?index=trueIn PDF document text
    • http://bobujosu.epizy.com/92768731934.pdfIn PDF document text
    • http://febarufowit.epizy.com/78562660647.pdfIn PDF document text
    • http://guwaduroredidaj.rf.gd/23683289709.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_b03b6bb9d1fd43c2afd3ef4553e7b817.pdf?index=trueIn 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_off0001375c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375C 5756 bytes
SHA-256: 83c3ffbb303afa95e42b0bebbd89734ec2e4c62756c73b7cc637d55986cecc3c
font_01_sfnt_off00014ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE9 13752 bytes
SHA-256: 63d8360d6ad5b3b8230a7901adfab1725de62e9986a3d1bf0122f51a005833a1