Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c931def9c405e3c…

MALICIOUS

PDF

82.2 KB Created: 2021-04-10 11:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c2e00325c094a8dea860879c5da4c84e SHA-1: ce6d1aab003a83309aa57474b13f3797d5081fe2 SHA-256: 4c931def9c405e3c18fbf4c46d3bddc16bca0da20c1bd5aa7601e2d49720d767
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'nipisod.ru/strik', suggesting a link farm or phishing attempt. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external PDF links, and the 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of multiple external URLs and the link farm heuristic strongly suggest malicious intent.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/strik?utm_term=behringer+xenyx+x1222usb+manual+espa%25C3%25B1ol PDF link annotation
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/nunir.pdfIn PDF document text
    • https://zexejofamimow.weebly.com/uploads/1/3/1/4/131438337/potupag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5fde0f59cc84d.pdfIn PDF document text
    • https://gefererasixo.weebly.com/uploads/1/3/4/7/134749514/8686337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5ff96d97801f5.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/rokinevamov7sg5x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_60613b1369cd8.pdfIn PDF document text
    • http://theharaka.online/spotted_lanternfly_treatment_philadelphiaufcl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_606796484b418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fe3ab2a2df73.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/vijarafo.pdfIn PDF document text
    • http://igcopyrightforhelps.com/145922572804bzxn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/luvowezatupa.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/fujuwowalov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e9e740-a0cb-414f-abde-7135aece87a1/bosch_ascenta_series_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d866925-9089-4eca-a1f4-ac3d1ba475a3/similarities_between_the_torah_and_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/ignou_b._ed_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/werorokapikasajew.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/luhr_jensen_little_chief_smoker_top_loader.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/automatic_control_systems_10th_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/concatenate_string_access_report.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/vampire_the_masquerade_character_sheet_interactive.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_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 5988 bytes
SHA-256: becea111c4a7fded376f1310329f9ddd55c832ad7b6f894f950e1f970e4f5974
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 11992 bytes
SHA-256: 441065594f348f8951537c5e159bf510cc6a8015b0d0c0e3ee76f40bcdd51c4f

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