Malicious PDF — malware analysis report

Static analysis result for SHA-256 43467f7df638bc8f…

MALICIOUS

PDF

86.2 KB Created: 2021-05-24 12:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 90fbe5027e223a321a41d352a783292a SHA-1: 30556500b3ca8df52a29523afee3881d232db170 SHA-256: 43467f7df638bc8fb49f1ea0da13790f5cf03831dec0412726dfa24db27c8c6d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to attract users searching for specific documents. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=prince2+manual+2017+pdf+download', which appears to be a redirector for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://gimoguvi.ru/strik?utm_term=prince2+manual+2017+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404745/normal_60486f06df11c.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/bizukel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_603c54ddabd17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5fecc17abcbab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_605523ccf3809.pdfIn PDF document text
    • https://kotemuzever.weebly.com/uploads/1/3/4/8/134884044/116523.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/193999e82af.pdfIn PDF document text
    • https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/fb08ffd9dd30.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/wemopigobabo-tanom-rotiteri.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/xerumezibevurof_fisujilesosed.pdfIn PDF document text
    • https://mimatetozolo.weebly.com/uploads/1/3/4/7/134707120/wiladurijixe.pdfIn 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/7ae38856-2bac-46f9-81a9-88365ac977a2/differentiate_impressionism_and_expressionism_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16b85c5-d60f-4390-8078-931f3cb01e9c/85511337210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec0a6a6-1fed-4a03-8ae5-97878cef65b6/best_photographers_books_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d42dc0c-6fe3-4557-ae8d-924bf70271e2/free_download_al_quran_30_juz_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/zujozijevonusapurajup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cde49c1-2a7f-43df-8fb6-4e02c37ce24b/wogimemipamujufudu.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/19511910884.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/vutiw.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/la_foule_edith_piaf_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92980106-0b64-4edd-902c-0dbdf409f20a/17832858401.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/infinity_ariadna_guide.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_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 5620 bytes
SHA-256: 5985c002f791d48a976e6a92fbc9d2afd6cf644d1876c4f4f0f390fb70075212
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 10672 bytes
SHA-256: b414bfa6d42688215f8cd7f7dd2b822145e51b18e5f663fdede04222bc308c0e