Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c986e2853c0901…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 21:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0f358d762871ecd49f4a3790ad281e1f SHA-1: 4afb657dd3b3517c89c2ed3bab0904c6c9a6b191 SHA-256: 19c986e2853c09015c1452e30dce1107f2f57276d1c3c898214d38b630052794
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=motorola+minitor+v+troubleshooting PDF link annotation
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/toperezezidabavirusi.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/5246045.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/winatagores.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/gunida.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/voxobumekud.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/nikon_f5_manuale_italiano.pdfIn PDF document text
    • https://fegexogemitise.weebly.com/uploads/1/3/4/6/134602812/b9a76585722fab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_678d7cca73584a2a9c0f7afe168c0773.pdf?index=trueIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_c2c3c8aded2241a3802f5bbe82596ffe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e523bd-4dcc-4be9-b725-2b838c3b853e/toro_gas_trimmer_carburetor.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_a1c55cd6070349498bbbbe45e59818f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74697170-f668-4b8f-a624-e46f46f64313/can_i_exercise_if_i_have_scoliosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c71355e-6c6f-4409-b1b2-41b2f6f7f3f2/quadra_fire_wood_stove_blower_kit.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_f8a0542271144b5098ccfffc18abbbfc.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_b0edaf2ffea14035b0fea98bb950ed71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/491fd388-f1ae-4fbb-b327-db13fc0efd9d/actividades_para_aprender_los_verbos_irregulares_en_ingles.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_f2bbba22a8e446d1b6416fad57ef4527.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/nba_collective_bargaining_agreement_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096ff28d-35f5-43f3-a5d9-8ab9d7c4ec78/ravumemigovelarofebagizo.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_58d0056aea674e72a362512d7eca277d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94512f44-6637-4966-bf92-353575cdb2d1/the_secret_garden_1993_soundtrack_list.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_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 5304 bytes
SHA-256: e5337a082604ba98c877cc6a9363778acc915ecadc7142a06edc23944cc921db
font_01_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 10960 bytes
SHA-256: cc063bd0722d477c1b92dcff8112dc55d90d6576079f42e7e3aeabaec72e4c56