Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9caef15c99b45da…

MALICIOUS

PDF

91.5 KB Created: 2021-03-14 22:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 543838b80a7adfeb20f9f6709d4cdb18 SHA-1: cee15afcf83112a7e5b2c678e11fc92c2effc9fb SHA-256: d9caef15c99b45da15650e979b3d5a07dcd7a90a83f5d1d993a113b047f6701d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links pointing to other PDF files hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of multiple external links and the use of disposable hosting indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=the+master+key+to+riches+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/setuboluraje/GicjShg/scmp_hong_kong_property.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/can_you_see_diastasis_recti_while_pregnant.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/6469443.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/bamadazezevi-levozisafenovil-filifev-rezuzojubiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd67d88ebb38.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/3179400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6009a9ef5ff53.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/xizibufa-poposugebonut-voxekobekan.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/9366655.pdfIn PDF document text
    • https://domaruvujus.weebly.com/uploads/1/3/2/6/132683142/tunaxodutom-legemarotuvoj-podipawamol-tadojemutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374533/normal_5fccc8ed4c74f.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/gitiar9/the_walking_dead_season_one_walkthrough.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/kovibajipurasuled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_6034c94933826.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/gizubaxexa_fegigija_xogetetigida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500417/normal_5fe2bd0ac6915.pdfIn PDF document text
    • https://zofizefeva.weebly.com/uploads/1/3/1/6/131636954/7622820.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/jitudexejixazolosavamanuf.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/7520b71e.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/3e91c8e0-b28b-4dcb-9384-4f56e8f48b02/case_files_internal_medicine_fifth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aad756-188e-418e-bea5-d83762e8faf2/fender_mustang_4_v2_review.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/prevention_of_food_adulteration_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb44cfa-500f-49c8-b58d-2163448412c5/juniper_bgp_vrf_configuration_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e41edaf-3f91-4da7-98c9-bef91851d803/sijus.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_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 5600 bytes
SHA-256: dd570d23c5bf6f516c53b9d419b4c5180cc380fee58b30ec32958a9b1bc7abdb
font_01_sfnt_off00013b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B54 10968 bytes
SHA-256: d2ec19a498ef16596f5be6315a6c362b1e3a697a8c7b0feb5837e145424fa6ad