Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3f4801267caaad…

MALICIOUS

PDF

72.5 KB Created: 2021-01-06 10:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c2b5caff2e3d49005e9b823ed4b3a717 SHA-1: 9cfe2d4fb4f998f660f80a92c84117eacca2460c SHA-256: cf3f4801267caaad6875a1f595a282d685ac80e9ec8e2bb74da20df8b587dd1a
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/123?utm_term=drawing+covalent+bonds+worksheet+with+answers'. Additionally, ClamAV detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The presence of a link farm heuristic suggests an attempt to manipulate search engine results or distribute content through numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?utm_term=drawing+covalent+bonds+worksheet+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5fab80c59d6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8fc5a5e0aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5f9227b0aa2eb.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/mulinoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f9460ca3a898.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/616d1fe8be5dbad.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/napusuvojiwe-sedebukugem.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/sizadagazagaj/describing_words_for_class_1_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89aa3ec-4bb7-4dc7-8513-27b161166365/kujopesaxamuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/el_metodo_descriptivo.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/jemepixatuxoxodufusoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af33a13-557a-423d-adae-53958918be52/scroll_3d_model_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/body_scan_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576eb3b7-1a97-4daf-af73-8406a5a08d31/soil_temp_for_planting_tomatoes.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/child_care_information_sheet_template.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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 5556 bytes
SHA-256: af42b1bb347aad3ac298be760d50169a7b2bc972bf3977d320b995e493350eae
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 10764 bytes
SHA-256: 69180bb674b0c0503a8051352c248c68a30973b425435e529a76e4b09a78b42e