Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17e88f9a8008e41…

MALICIOUS

PDF

70.6 KB Created: 2021-05-29 12:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cc06363749b5781f79efdd42fa032e91 SHA-1: aa4bad3cae1d7d6c740d19ea3afc461ff3cefef7 SHA-256: f17e88f9a8008e410909d8711fcab63fe27ceac986e17b0dd94a68ff99affde2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The primary URL identified is vilenefex.ru, which is likely used to host malicious content or redirect users to phishing pages. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=volume+of+rectangular+prisms+worksheet+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5ff210a2c6d4a.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/babafukegigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_605028a49b9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_6067dc7654d41.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/48adcffa22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_5fecc624a21c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_605dfbb598a1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5ff84c5718c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_605251762dfe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_604722e06652c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_6051002d3668d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fe6708c650cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5ff817ec1a179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_601a4a87a5bf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/30e00720-7334-470c-aff7-bc0cc0b6445b/uses_of_gravimetric_analysis_in_real_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fe7c0e-91a2-4945-9742-1f2a1db1222f/how_to_measure_t_shirt_chest_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d718e7e5-4707-4556-819a-2d50c1899a3c/geologic_history_of_north_america_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69d5d06-445c-4f81-90ac-bd814ceffa87/13656180348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8663112c-6bf9-4dfc-a82f-33bff17e7e22/73329529244.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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 5572 bytes
SHA-256: 6e15962f6072695759e78ea339c4cbba45a6633bddf6571b096a6208e03680b2
font_01_sfnt_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10116 bytes
SHA-256: 6b0d3b3f451355ebe551c217be3669a69560940d08e2b57c62e8f3aa759320af
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.