Malicious PDF — malware analysis report

Static analysis result for SHA-256 79871238dd5e2f3d…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 05:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 174d7f9f417c07d9255cff4f2d02584e SHA-1: fca8cf08142f5371f174a8e6484baf1a53211f09 SHA-256: 79871238dd5e2f3de0beb24e1a3a5241d9893ecb7ef675fae395da2d3c42d517
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as insurance-related documents. The primary purpose appears to be directing users to various websites, likely for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic confirming the presence of a large number of external links on disposable hosting.

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://jottigo.ru/award?keyword=burglary+and+housekeeping+insurance+pdf PDF link annotation
    • https://cdn.sqhk.co/finulepaf/8fhduSE/55992892182.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/mapig.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/aVjiiiG/offshore_boat_races_lake_of_the_ozarks.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/6973766.pdfIn PDF document text
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/gitubugovused.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_c7e998271eb24db48e5ca9afc9252aa3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/ib_physics_internal_assessment_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/gopafabex.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_b4e28611b50c4c51b131cf2736209dde.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_d8f68d6831e94f72a416afde651e77df.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_56cdf2b8d6a340d3b96f467660551bb1.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_cedc0918e696443dbb0cf829cde89baf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/online_to_autocad_drawing_converter.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_17c25e1145cd4a7498ab45142ea2525e.pdf?index=trueIn PDF document text
    • http://makakanow.onlinewebshop.net/39671445348.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 5632 bytes
SHA-256: 11874bbf3811d0381315069ebfc3e0aeb30f80ca513857e47cc072d893cc95d7
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 11212 bytes
SHA-256: 80cc59d63f4dcd4b2766babdefe4834404d86613f5a2cf782566ebc200799704

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