Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dd2f8b6779fa31…

MALICIOUS

PDF

70.8 KB Created: 2021-06-11 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c268172c2a4613632db55a9a4bbe57d9 SHA-1: 67af24272e0a90412907d1f0d94e2c0c7093b249 SHA-256: c4dd2f8b6779fa315084df90bed3782de4d78768e0a0671196fc038332bd0cc2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://infrive.ru/pbw?utm_term=physical+science+investigatory+project+titles', is presented as a lure for project titles, but the overall structure indicates a malicious intent to drive traffic to potentially harmful sites. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/pbw?utm_term=physical+science+investigatory+project+titles PDF link annotation
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/30e72.pdfIn PDF document text
    • https://lafatizurekasat.weebly.com/uploads/1/3/4/7/134748402/8388975.pdfIn PDF document text
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/453196.pdfIn PDF document text
    • https://doketilid.weebly.com/uploads/1/3/4/5/134529618/1109587.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/22a51b84-26ca-47d3-854b-335eec198168/tropical_sunset_surfer_by_amy_scholten_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51043055-e8de-4839-8e3a-7e1354839187/how_to_connect_hose_to_hoover_steamvac_spinscrub.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/59860819484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701e6bb1-3855-4f0f-9307-eed0437e34b9/lamagijosedifowelepeto.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/cnc_technology_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5986b03d-28dc-4101-a91f-7ca4237330a5/is_there_a_reset_button_on_canon_printers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3aa187a-2c97-49a7-9196-ae3f6a677268/29955387626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d5ac10-9894-4dfe-ac36-90eb0c96ba54/types_of_data_analysis_methods_in_qualitative_research.pdfIn PDF document text
    • http://rizukokodi.pbworks.com/f/85109765883.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/download_harvest_moon_fomt_gba_bahasa_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b44243-96b2-4aa2-b48a-266a65e8f1d7/23966352065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24104c7c-b832-4b20-9503-49fe55aaca6a/78029268284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1b7adb-ee41-4875-a0ad-282410977b5d/how_to_download_final_cut_pro_10.4.7_for_free.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144611202/16863032019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1c082e-6d64-458f-865b-66a498bbb320/zowerodizupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0f118d-2b38-48f9-a0fd-f1c95f9caaae/proof_of_service_by_mail_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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 5432 bytes
SHA-256: aa927c0f23cadba209805cd916c893f22c548e4a87d2e8b73d751b54a5577719
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10092 bytes
SHA-256: 2c98c3b282241076adf5a71b975e934fd2ae47902d5386fec3afc8b9a5303c80