Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2958bacceee056…

MALICIOUS

PDF

69.0 KB Created: 2020-11-10 11:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e94a0442c1938d5039cdf34c5bfc8c1e SHA-1: 689a5545575909b99e5d21af710fee8ffedcd698 SHA-256: 1c2958bacceee0564da17ea978f8a6a73706a16e7750c4ce52194f8c50819856
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for a large number of external links, suggesting a link farm or distribution point. ClamAV also detected it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, including one pointing to a potentially malicious domain, indicate a phishing or malware distribution attempt. The file's creation by wkhtmltopdf suggests it may have been generated programmatically for malicious purposes.

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://trafftec.ru/aws?keyword=rna+and+protein+synthesis+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5fa8a115c06dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_5f98344f716de.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/79230f75e3348d.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://s3.amazonaws.com/xifabilejilab/dapivalipuluxatenebotixo.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/pythagoras_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0dd82d3-0005-435d-8e47-62a84cdc47cb/blood_magic_2_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/newitidonidil.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/kirum.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/baixar_adobe_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/how_to_delete_venmo_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/vadobiveg.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/34427841163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2973e63-79bb-4d1d-92d5-affcdf21e0b6/two_way_anova_calculator_mathcracker.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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 5004 bytes
SHA-256: 7dae4991b6f2cf674ec37b20ddb7da5e975b96cedf799b55ed1d8453e1122a3d
font_01_sfnt_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 10344 bytes
SHA-256: 834f053929e08dc8c9195dfc755c9da851a37bdd05b6c7be29d17ce3d9969c83
font_02_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378