Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c9384e2681c9f5…

MALICIOUS

PDF

88.7 KB Created: 2021-05-07 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2c498d3c0aca31d4132266677cb60e4b SHA-1: 17a061f1116092d4e5e872ae75f59e15e12c3cd8 SHA-256: d8c9384e2681c9f5c252674c9c8612440a3d3ab5d492e4217f3eee6554ebdf7f
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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.
  • 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
  • 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://pelibifir.ru/strik?utm_term=lakshmi+narasimha+stotram+sanskrit PDF link annotation
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/2144551.pdfIn PDF document text
    • http://new-leggins.site/wegumupokaridukizurjnhc1.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/gcsN7x3/78357219104.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/fighter_aircraft_design_project.pdfIn PDF document text
    • http://agentsoft.space/tababidife0ak77.pdfIn PDF document text
    • http://reawolt.online/tuliditufodph.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/igeLcII/3294196547.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/b0d85e12fd7f1fc.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/jixapugogolo.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/otrjiie/jibabed.pdfIn PDF document text
    • http://yachts-4-sale.com/gml_camera_calibration_toolboxnehd3.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/small_restaurant_business_plan_in_nigeria.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/3eaf54c5-05cf-4028-b2b3-fdb5e495c983/blackburn_trakstand_ultra_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae808637-cda1-4aca-a1ba-fe98a2f5bda8/tecknet_x366_keyboard_manual.pdfIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_b0e04896ba134286b8b60373d31cef48.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_c3dc4f1f796a450081c0b0fd312924c2.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_f428befeae5546d78a2e14418444079e.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_f547fd74c09d41ccb7d9a4fcde3ee863.pdf?index=trueIn 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_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 4900 bytes
SHA-256: 1bcfee8f43a7dac8c6823717070c2eeb46ee5b6e9fcf7f0b032fd6bb0a45d17d
font_01_sfnt_off00013e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 12796 bytes
SHA-256: 4d86cb6eaad80aeef203b0e94aea42c3989d884ac225ef41179227095ef8fead

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