Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b36b2676223dfa…

MALICIOUS

PDF

88.6 KB Created: 2020-12-17 21:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cbdaf032eeab958377e4ef3f991507ae SHA-1: f9e9fa88d483370edd53407d23f7dbf11c6d765e SHA-256: 16b36b2676223dfa98ee6a41706271c95b6f36da0036165acbe5f72523788ef8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO poisoning attempt. The presence of a malicious redirector URL and the sheer volume of links strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=divinity+original+sin+1+crafting+guide In PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/c385a54d925d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fce35b8a697c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f90cf6362b29.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/lamakixepotu.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/8f5e5.pdfIn PDF document text
    • https://jezinuva.weebly.com/uploads/1/3/4/8/134869759/4205807.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/1557946aba6.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/xojafemori/latipisexusofozalusatabug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08219612-8c25-488d-8b3d-e6384cad2848/oyster_mushroom_spawn_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/diablo_3_witch_doctor_build_reddit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c02d6609fd0ee7976524/t/5fc879bd970db930d9c25346/1606973885331/88970013960.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5922424b06a7eb31f4865/t/5fcb4da61df7590d80dd6ce9/1607159206679/bubble_gum_simulator_pet_shop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd251c3e297f74585c0e27/1606231325393/nearest_five_below_store_to_me.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/67569923589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e911fb2-c954-4392-90f3-9fbb63481a98/peliculas_de_accion_en_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/aria_allergic_rhinitis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/tonefebofow.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_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 5400 bytes
SHA-256: 4b3b417b1c1443b477798959e9e1ffa2980c337ffb2512866c603d616e4ce46a
font_01_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 12300 bytes
SHA-256: 4f85214d48009e18459aa3120fe16b1950cd9263d3939cfae9a6ad6b897e25e3

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