Malicious PDF — malware analysis report

Static analysis result for SHA-256 2271b2f830365021…

MALICIOUS

PDF

114.4 KB Created: 2021-03-25 09:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 155cf80de54cff0ea115d3f29c2408ce SHA-1: 85a09378e3aae543463d9efa540b90ac61beeff6 SHA-256: 2271b2f830365021c841dc9ee69526cbbaba4ef25e75e53842ce66fd91d1df3b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'Las inteligencias multiples howard gardner pdf'. The presence of numerous external URIs and the link farm heuristic strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=las+inteligencias+multiples+howard+gardner+pdf PDF link annotation
    • http://jiwapadenejeza.getenjoyment.net/bosch_es_4-1m_wir_element.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/51345786738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_6026675e3d42d.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/verbos_impersonales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_6054d0e2b4a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_602da11274c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_601d8454320c1.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/dieta_atkin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390328/normal_5ff97dbd3c76f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fec5aa834d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5fd76e7ee8e80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_8e7f460f85e6414198edda8845b761e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/vapane.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_438cf6414a7543eb955b74ea4c48bc6f.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_99c98b7f32804285a6879bcdb143e449.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_5ce472060d9a469e80001ff7b01abd87.pdf?index=trueIn PDF document text
    • https://d90c6e9a-74f4-4e1e-b9b2-b16ff3e5d9fd.filesusr.com/ugd/136d07_7635863bdec24e1fa2046385cebaa8eb.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_5e795b30e1cd445c9a69a4427a1c406c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/39666316176.pdfIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_b87780f487634a7abcc11f7063fd9ee1.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_405299d913ef42248d77b150d9c63c7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/91244076005.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_b83965a7b2254657b3d1ab91341b0d95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/the_first_48_missing_persons_season_2_episode_8.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_off00017de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE8 5604 bytes
SHA-256: 883776fec38e752daf75fd9137f134f4c62f8b895468d673289665afdd99bd17
font_01_sfnt_off000190e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E2 12992 bytes
SHA-256: 0cf28c368b6abbb5d3640da5b8efbbdd77e9da97ad9dad4e137533b9cffaf243

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