Malicious PDF — malware analysis report

Static analysis result for SHA-256 687fb18f3762c3bc…

MALICIOUS

PDF

69.0 KB Created: 2020-12-25 20:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f8dd0c845d365b60054ed0844d34a049 SHA-1: 9f6041e6bce4119c6898bac08fcb8cc23bcde7f5 SHA-256: 687fb18f3762c3bc50894db50c56894b3dc6af6ddd5b184ff2ba43e08675e205
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on Weebly, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful external sites.

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
  • 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.
  • 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://traffnew.ru/strik?utm_term=green+bean+casserole PDF link annotation
    • https://bilopoxowug.weebly.com/uploads/1/3/4/4/134439404/5317492.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/84a0970972bf0.pdfIn PDF document text
    • https://kedupopadas.weebly.com/uploads/1/3/4/5/134588367/5cd067ba16d.pdfIn PDF document text
    • https://xanerenidijuv.weebly.com/uploads/1/3/0/7/130739333/zorojajalesuxized.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/f1OhhCj/fubulorumije.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/sekamebafate_fatavotexugoke_naxitubukir.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/napejaxosinages/all_power_generator_apgg6000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02caddd6-70ba-41bf-afa9-33308472c075/chemistry_a_molecular_approach_4th_tro.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/21782634586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0580b1-be1a-4eb6-87ff-76f944889ea0/7186495698.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/godofuseva.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/letter_of_application_to_university_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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 4964 bytes
SHA-256: f986f42011163440980e96a78563307a8ebdcc67b993cac09fdf666d5a57da62
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 10664 bytes
SHA-256: 009dd339aaddb753d3c48ceda9d5b7128cc9ba54560715371d6d75feecd70aa2

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