Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cf395be8d1a72d…

MALICIOUS

PDF

83.0 KB Created: 2021-04-02 18:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c1d8652a7aebf02eb58bce9bf3bd8ce3 SHA-1: 884c10b74acc872b49a99afd966adc9e41834ae2 SHA-256: 61cf395be8d1a72d735356c421b2d2ca5c62e5a2d583c2caa7f992d5ae214d89
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://druttle.ru/wix?keyword=raze+2+unblocked+66 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7b62cc-869e-4d3a-864d-2cc7a9cb9b98/jedolaludekerola.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_8fbeba285111467c89512d1a0fe71c49.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_9797eeac4fe14feca1bcdacd043c170e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f79e5a-8a5c-43d4-9bad-02dfad7b57bb/51999961554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecc4094-6565-455a-8fda-ff1c3f7427e1/a_single_man_tear_meaning.pdfIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_bd5aefc5bd164c87b451ef1755144061.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf7bf7a-047b-47e0-844a-d9d131c30103/how_to_operate_jandy_pool_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d2f611-d342-4259-9cce-cb6cd3f9c5e9/la_sombra_del_viento_pelicula_sinopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5b6efd-3a6e-4cb4-89f6-a0e3192e6b90/how_to_read_a_poem_terry_eagleton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e4aa85-c406-47da-8bb6-c8cee29dea44/kesunedufadadefozob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f96f86-f6c4-4ee6-b328-1d456ae44a41/26588138352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df3ed1a-0270-4e8e-923e-4323355fe214/zonetagolekogakuku.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_d0a2e1d74d6a4c3b9b5cb0f61bed36d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb0ca63-c54a-478e-b656-e24c0c653599/dufujosaduxonafezanimisi.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_a0ad5bf6be214db9904b428ef39c2f7d.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_32a4e4a03e574d9bad8dc941de8bcf98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55dc13d-8f0b-4302-8aca-939b28436b5e/compare_and_contrast_literary_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/depugi.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_df976078d8a14818a14432927c8ca69c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/jisosabalezumevubakiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/ejercicios_resueltos_de_identidades_trigonometricas_1_bachillerato.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_3ced65df88224326a81d5efd53cb8274.pdf?index=trueIn PDF document text
    • https://bc5d5878-7fc8-4b9f-a3e6-8b1a1bd4f47a.filesusr.com/ugd/3835dd_ef4ae4f5a3b84b39880c0e86ac8b67c9.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_0a17410260fb48df82b37ec0024e85d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/gisenezuginural.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/sujog.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_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 5204 bytes
SHA-256: a4daf1a04256cb36a7bb88175243400489fe7a74499090a69f438b8ba98e74bc
font_01_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 10696 bytes
SHA-256: 53bc58daf99a1e358067588e3902eae4cba5927679265f157cfca72fe5a20bb2

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