Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c82f7f44fa5489c…

MALICIOUS

PDF

111.2 KB Created: 2021-03-25 10:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 243f1a670e392c5e19b23c01f29f877b SHA-1: 8fa67c7bd5ef8b13511f6d9ad3897fe21a96f2e8 SHA-256: 4c82f7f44fa5489c42dc98e2efe83c403059efe695888cd0d8f5668e13432d5d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/aws?utm_term=attack+on+titan+manga+wiki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386354/normal_601b631290d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_603201e4c906d.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/nixukirigi.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/6238480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_600443251df21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_602882801451f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482426/normal_5ffa7513dc74e.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/dexikeg-xegogad-gukima-joduz.pdfIn PDF document text
    • https://jifujutikawe.weebly.com/uploads/1/3/5/3/135328504/5a71fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_603056dfa3bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_603c36818c063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_600dc85c6c1e0.pdfIn PDF document text
    • http://diwolekeku.22web.org/polarization_of_light_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_60132b99c2a99.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/matetujetowopa_pimudidixusatu_gojibojigapo_banomomaj.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/viwoxuz/pasado_simple_verbos_irregulares_en_ingles_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/financial_policies_and_procedures_template.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/blank_board_serializer.pdfIn PDF document text
    • http://pazipinabobon.epizy.com/43318235385.pdfIn PDF document text
    • http://tupoxejaka.epizy.com/sets_relations_and_functions_class_11_maharashtra.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 38348 bytes
SHA-256: 4c9ff9915b519622a77b7590a4b87e1b3db7ffcf2cd55ec5cdf472514322c0a8
font_01_sfnt_off000175cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175CD 4960 bytes
SHA-256: 4c1fdcc92f47f07a0e5ac4b4d3af6549e4eb19e913f05941cd2aee7064be3bf9
font_02_sfnt_off000186b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B6 12184 bytes
SHA-256: 7cd0f61b5b1f59b40aa93e9318c7a6aa90c785f0eadbf2a0d1d8b36b05655135

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