Malicious PDF — malware analysis report

Static analysis result for SHA-256 7feb26789c5d534c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 23:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1c6410aceb73a3a902c72917ac57c83f SHA-1: 7b4d0f48013c7dee75fa59379ee7d1cba1bffc5f SHA-256: 7feb26789c5d534cfbdf26a628a445b48e04beadb02b812e1db0505666cc5f87
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The primary malicious URL identified is dafemum.ru, which is associated with phishing lures. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=gold%2527s+gym+xrs+50+weight+bench+review In PDF document text
    • http://prognoz-football.club/auditoria_financiera_boliviap2dzh.pdfIn PDF document text
    • http://bitcoins-profits.com/sakoxevuwudalejefob4hjuv.pdfIn PDF document text
    • http://idealicaufficiale.website/kazot4jt2h.pdfIn PDF document text
    • http://vidclips.design/paco_el_chato_secundaria_espaol_volumen_2_segundo_gradon5kfb.pdfIn PDF document text
    • http://uose.xyz/how_to_work_for_cia_clandestineaucfi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_1b4cd2d56a5e454c9cb632d12f22b63a.pdf?index=trueIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_5e6b2b48bff74f108e43634c3456a102.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_8b506eac4efc446d9ce15ba8099e5588.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_edd780bb6455481e8eba2db461978a96.pdf?index=trueIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_c87f8194dc284b6d907c36e55048d663.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1661c00-7727-4872-b67c-6d8bf88d4516/zodorevetesitoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ccaf91-8da3-4ba8-9b95-0ec8108aa6be/42887768714.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_22629b55bd604970bb7588e3da267a2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/194749b5-bb52-436d-8477-bf8474931106/mikimazororobifilezed.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_b698b80cc05345e8b1c54daaf5f958a2.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_74139c00d00a4b28bd6eb9e8ca1bea8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3970406c-dcf3-4d5d-a285-ab6f46115353/troy_bilt_21_self_propelled_mower_190cc_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31da5a66-01a5-44f0-95c0-7b445014da8b/47866903981.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_51140c7163834eedb99bf71b02e2f1f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06bcc24-8b08-44d5-9223-6ce0ee31b32d/final_fantasy_7_remake_pc_release_date_uk.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_e8e737026eb54b7ea29b39026ffcad08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20e0bd2-bfa7-4f13-96de-eaf043ddfd9d/16626137368.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_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 5936 bytes
SHA-256: 90ceec0dff8698ae628b41deb45c25ff236c2a4e7988fe0e516e97bfc2b45802
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11628 bytes
SHA-256: a1d2005f8dfccd03b9e129993d63bc5366860a29e12300d99b381f65b1601f8b