Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c43e4a059a900e2…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 21:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8bcb0779041789bdb2a89bf219f33a3f SHA-1: 29b3d96c064f64889fc3c4fcdaa307b97d464803 SHA-256: 2c43e4a059a900e26f1e103a4bd0ef480fd7434a25d724def54f088532b4a75b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. ClamAV also detected this file as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users or manipulate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=sample+7th+grade+essay+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451033/normal_5fe9248bf21be.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/jeFjchg/10846891976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490252/normal_5fce1588a8a5d.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/5CQoiRb/zoraladirawowexajifuk.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/fovuzotulemu-buzunipiruzikeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444884/normal_5ff43a1ec12f1.pdfIn PDF document text
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/bevumat.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/7QjgjUr/this_means_war_film_trailer.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/segezilikuwulorax.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/Qo0jgcy/19043673100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_6022747faaa1a.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/jozetej/49430254708.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/magyarorszg_alaptrvnye.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/riwus.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/autodesk_maya_2014_xforce_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/bwv_565.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/physics_equation_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/27954341589.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/linear_equations_with_fractions_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/aala_baburao_ata_ala_baburao_song.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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 5784 bytes
SHA-256: 8854f480eefca3eb8f2121f2adbf011b5f11817e26872a29276e79044f366c8f
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 9960 bytes
SHA-256: 555b5875a313d2ae4a001cbc0ebb8408ee5dcbc174268ad99ab06ff935ed0eb1

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