Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b5b9cf7294eec2…

MALICIOUS

PDF

73.6 KB Created: 2021-03-07 09:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5395a8b78d45bdad0b44198d466567b3 SHA-1: f3d0d8dc334477a8cf33225a13e40d3652be9508 SHA-256: 47b5b9cf7294eec29193c6de0e113612f2aaf6c1eb359ecf8ff2312dec83328a
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to COVID-19 tests, designed to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/award?keyword=what+are+the+types+of+covid+diagnostic+tests PDF link annotation
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/fewolig.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/hjfyihb/barber_shops_houston.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/bagepavimon-kipilibagujag-xonujokunol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_60266160aedc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6035bfa37a23c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_600bc57c5ea25.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/3129762.pdfIn PDF document text
    • https://telusexuv.weebly.com/uploads/1/3/0/7/130776200/4788530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_601062245d501.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/71a9dd2c2a93f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5fe3a66c64b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/K6idjeG/kilutuzeweborabuwone.pdfIn PDF document text
    • https://vazonani.weebly.com/uploads/1/3/1/8/131871537/2c41db9c387.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/fisizaju.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/sajatesawodiji/kankakee_river_state_park_fishing_report.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/gekenosimedamijev.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/guvaxe.pdfIn PDF document text
    • http://totuxivez.onlinewebshop.net/what_does_yellow_triangle_mean_on_security_system.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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 5560 bytes
SHA-256: 5cdece92fd7990cd6c400e2cf5f787732415085cb3dc9efdc6a714e096ba0b84
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10356 bytes
SHA-256: dacc2efd8f37e62d3877930b0417f242d144ba47751ed29edd18ae36b5d7bfca

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