Malicious PDF — malware analysis report

Static analysis result for SHA-256 61977fd1e897bc41…

MALICIOUS

PDF

70.9 KB Created: 2021-03-17 06:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05b248f4cc5848b92c3181c671748f2d SHA-1: 64b1e20a99ef83471dfadb83c9d41cdd114401c4 SHA-256: 61977fd1e897bc4143fec0a14f7e2b5bff880be0cc7c080c927df354968e12a2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to suspicious or unknown domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the PDF's structure as a link farm on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=causes+of+the+revolutionary+war+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494138/normal_603a6bd1dc2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_601fff789fd94.pdfIn PDF document text
    • http://naturka.space/tabereroduvupodosaje4zn1f.pdfIn PDF document text
    • http://sarkife.site/fishing_pole_for_crappiejchtj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fce89f4a9ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_600b420c1e5d3.pdfIn PDF document text
    • http://fionainthefield.org/femiwijakivlsg5.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/94823907712.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/basic_computer_skills_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5fedc3d42323a.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/pisedij/crud_sqlite_android_studio_github.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_db0dd2c9c3064de09b9fe603a05d5cc2.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_46c26d956dc94cbe8b562945c99664cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/dialysis_procedure_video.pdfIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_347acc08e90045608eccb7a8a02b4ed7.pdf?index=trueIn PDF document text
    • http://molujafit.atwebpages.com/maxi-cosi_pria_3-in-1_safety_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/elite_platinum_pressure_cooker_parts.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/how_to_open_frigidaire_affinity_dryer.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/netgear_gs108e_manuale.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/review_label_makers.pdfIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_d0f3c6d39f2545e89817b3f16b6775d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/popeil_pasta_maker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/25257930775.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_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 5076 bytes
SHA-256: e0eb9b171d2a7c92fd54760d9be1f23fcca6f849429820d3f932236d50a8449f
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 10848 bytes
SHA-256: 4db55fab7725cc2632df38c126403a7ea9e8e92560dde51c0b1e09ad43364058

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