Malicious PDF — malware analysis report

Static analysis result for SHA-256 288fd3a2414303e6…

MALICIOUS

PDF

77.7 KB Created: 2020-11-13 06:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc76560c94701160a6cc69366d569feb SHA-1: d74471c6eb2997e5713ea232a0caa550aee43cf2 SHA-256: 288fd3a2414303e68337f19da0ba97333445941fe691e88d4106a4f40fa572df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a significant number of external links, many pointing to PDF files, suggesting a link farm for SEO manipulation. The primary malicious URL identified is `https://traffnew.ru/strik?utm_term=derecelendirme+%25C3%25B6l%25C3%25A7e%25C4%259Fi+%25C3%25B6rne%25C4%259Fi`, which likely serves as a gateway to malicious content. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=derecelendirme+%25C3%25B6l%25C3%25A7e%25C4%259Fi+%25C3%25B6rne%25C4%259Fi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f8c56ba582ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fa1a3c7a1a52.pdfIn PDF document text
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/manofukoroni-fapeleri.pdfIn PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/ruriwamodajofu-rumijov-peforomazeva-joximox.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/1614857.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/6176058.pdfIn PDF document text
    • https://daxedinojadu.weebly.com/uploads/1/3/4/5/134590150/wuluxixesajopidikoto.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/76185755-dadb-46f1-8b4a-09d8ef5a43fd/graco_forever_car_seat_booster_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f93e459-1916-4f10-a068-bb562ebea97f/90859375938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca82a649-6059-4fb2-a906-b282bac560f7/41868643911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89879102-2368-4881-9f2b-52a92b8b8648/zimele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ccb04a-e6e8-42af-b6e5-089fe4a97412/57754197272.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5248 bytes
SHA-256: 534009c1b5fc68b4914dda1b8ddd3c0cd3554847e328e4ee986aca668ae7858c
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 11772 bytes
SHA-256: 4bb858bad5f342ffebc1d48826ecf099c79013038a404820774f386dda47e4ea

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