Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c4cd37b716ebe1…

MALICIOUS

PDF

84.0 KB Created: 2021-04-19 12:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 44e14ff3bec5d3888812c764f77c40be SHA-1: d1b423744b67882fae2c6bc2e7e95ece4cd49b41 SHA-256: 65c4cd37b716ebe1fd8a01fe4fbe198ac2b60f3b1086b6ba7a863997353d9a62
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. One of the primary URLs, https://nipisod.ru/strik?utm_term=formato+apa+2015+para+tesis+2019, is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links indicate a strong intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=formato+apa+2015+para+tesis+2019 PDF link annotation
    • https://mogogumabes.weebly.com/uploads/1/3/4/9/134900096/nepidomilama_wikatuwu_xupiwikud_rudurapiwira.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/ih4heji/9_months_pregnant_symptoms_nausea.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/ihu37hd/zemudusofopu.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/bibosiwovuxuf.pdfIn PDF document text
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/1186913.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/supoxebevedo.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/ravajapubisanax.pdfIn PDF document text
    • http://kidobujugi.mypressonline.com/class_11_python.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_71e141ab27844bca832de29aa852ec21.pdf?index=trueIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_b9c41d9cca624c948f8459abf0d99bcf.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_16e33893a2934197a491e48a8cc49516.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_e34cec959c8e4d95803a9ed77fd5f7e9.pdf?index=trueIn PDF document text
    • http://vilumepidiwego.myartsonline.com/7-2_reteaching_similar_polygons_answers.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_a3830bb5a0654ca896a1a72e556858bf.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_145958df6d4f40f3919eab5ee77861c6.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_929774891c214e359e313a12575e4f54.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_091635e23bae402e9f1b542727c1541c.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_5ff8791ef7c548c38f01d99bcd17f6a2.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_dcb2afc54b0c488097511fa6b0632924.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_65fc316b6cea4712a0c9efa2fbbb7b1d.pdf?index=trueIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_0d47da43b020490cb2e18f74b04ededa.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5496 bytes
SHA-256: efcdf8fc891d5cd7721a1f204afebb0e63da514b06f34b0f4f4e82f53846af7f
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 12440 bytes
SHA-256: 9286f8b0f890e51c4ac0fdb401d8e88a4ae31b36e9a03accb177bc7a45b4d2a6
font_02_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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