Malicious PDF — malware analysis report

Static analysis result for SHA-256 412dc61b12127151…

MALICIOUS

PDF

110.3 KB Created: 2021-05-29 23:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 958626e0003595360c0d9e1bf72e3615 SHA-1: 222c80ecd4d4fe9706395981a7a0b6fc1dba879d SHA-256: 412dc61b121271516e1d739a23802477b815196c74a1137b8b8a9793c8c5ec9f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=problemas+de+hidrostatica+fisica+resueltos+pdf PDF link annotation
    • https://jasesinokez.weebly.com/uploads/1/3/1/1/131164090/6715725.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/tabulazekezas.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/bubokopeb.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/9793519.pdfIn PDF document text
    • https://repowuvosifopel.weebly.com/uploads/1/3/6/0/136050091/5443057.pdfIn PDF document text
    • https://wolemokopafono.weebly.com/uploads/1/3/4/4/134460240/5866085.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/7447514.pdfIn PDF document text
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/selun_tenogog_wotujafajuki.pdfIn PDF document text
    • https://sawefewukiwow.weebly.com/uploads/1/3/1/4/131406412/285011.pdfIn PDF document text
    • https://suxeruto.weebly.com/uploads/1/3/4/6/134665584/nupipixawuzu.pdfIn PDF document text
    • https://tonikajolokoge.weebly.com/uploads/1/3/0/8/130874266/8981797.pdfIn PDF document text
    • https://koxulisel.weebly.com/uploads/1/3/4/6/134600043/8633812.pdfIn PDF document text
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/26e1af.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc92982-d954-45f1-943f-1cc5ad3f5b57/98877393402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c26314-ee19-4fb2-8019-cb76ede6dcfd/66963620360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982a795c-ad43-4950-bfc1-b2ef7f6084dc/visual_basic_code_open_excel_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271b1b69-2f68-40cc-83e1-76d57a76e1ce/how_to_write_a_comparison_and_contrast_essay_point_by_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec5e49c-3363-4e57-b9d9-88bbb629281e/96056446192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5826d238-d2de-4637-afa7-3c2342b9f20a/free_online_historical_romance_novels_to_read_now.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 9812 bytes
SHA-256: 07186bffd3c6a81dc1d4e3f6ef700d8323ce8d27f24439da0f38928e86204f49
font_01_sfnt_off0001435e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435E 6564 bytes
SHA-256: e2724b925f59ff11ded218400a9b3dccbad20a64ec7a29409ae9c5cd4ef1cf30
font_02_sfnt_off000156d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D0 5536 bytes
SHA-256: 5e3edca0760a490a8480c3a145349bce71bb0ee238e8f779f574f43cb108ab15
font_03_sfnt_off0001696d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696D 12896 bytes
SHA-256: bc21e1abd1dd4432a50cfadbd17ff7c3635184fb46cbb20438d7888038861fa5
font_04_sfnt_off000193bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193BC 16148 bytes
SHA-256: 43953a3893a3c660bdf2e5f45974240835844d4c93f33037fc5f3a24d9d1a8ef

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