Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd20466cfce16f5…

MALICIOUS

PDF

70.6 KB Created: 2021-02-11 15:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 68f4d54c8b91f8b4cd3f5044047c7e34 SHA-1: da8e57e6c288f62b191164e67b6fe25ed53024f1 SHA-256: ecd20466cfce16f54d7c24b4062caf5bf3c636ea7e001b77259e857f7bc9e6d6
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=buffalo+ridge+elementary PDF link annotation
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/9668363.pdfIn PDF document text
    • http://somukegizos.66ghz.com/ejercicios_mediatriz_y_bisectriz_5_primaria.pdfIn PDF document text
    • https://zafewogi.weebly.com/uploads/1/3/1/4/131407253/sufisaxi-jazoxiduti-zulutetokigesar-nuribamijepo.pdfIn PDF document text
    • http://xabisafeb.22web.org/formica_vs_arborite.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/zapexekupib.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/patawatexevej_muzulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_5fda4a4d19068.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/rutuluroduzig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_601212641efac.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/sugufazalinofuxuwax.pdfIn PDF document text
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/kemefitaw.pdfIn PDF document text
    • http://boomua.site/dash_mini_pie_maker_reviewsv16en.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapedefomagejev.epizy.com/online_rar_extractor_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/71505920987.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/betiramujunama.pdfIn PDF document text
    • http://fojinejadasetax.epizy.com/minecraft_xbox_360_modern_city_map.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/einstein_riddle_houses_answer.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_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 5200 bytes
SHA-256: ba259d715bc3f4fbd546ef17e2a6102c2e68660c2a56a3c1924ca8057749fd1d
font_01_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 10496 bytes
SHA-256: e6bb3bf4a4d243bbe129a275346a15dfad6c672eb9da967c49c6f0ccd0cc4121

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