Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a78bd1018b0082…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 15:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b319b41e5d92b02a0ecfb7e41d75a786 SHA-1: c7127e15c50d6d211463d2c7a4229f8f7736ac48 SHA-256: f6a78bd1018b0082be56bd3b88a56e220733e30bf44e2ca89a413a0fc59782db
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dugedepap.ru/wix?keyword=last+day+on+earth+bunker+code+alpha PDF link annotation
    • http://ludesajezopaju.medianewsonline.com/processing_of_seismic_reflection_data_using_matlab_download.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/auditing_principles_and_practices_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_6039e55b6ebdb.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/fd49a7ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5ff2dc0a7acfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_603113a3e8b4d.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/razezawamu.pdfIn PDF document text
    • https://nilemesobipefuj.weebly.com/uploads/1/3/2/3/132303022/8745757.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/sewame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_5ffefe3d7e251.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/70959326951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6010a4cbe8bd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webubop.rf.gd/mofenusobib.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/lefanomi.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/chromatin_condenses_to_form_discrete_visible_chromosomes.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/xijedijobixod.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/kadnlarn_beden_dili.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/anomalias_geneticas.pdfIn PDF document text
    • http://nokolul.epizy.com/cosmetology_written_exam_study_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/how_long_does_it_take_to_get_99_crafting.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_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 5408 bytes
SHA-256: 3eca53334d6cdabf40bf28b6e0f97d3c6eab88055c544505e2c93e65a2c909ed
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 10568 bytes
SHA-256: 3705ca7336e1289a101593bb4825294ca8c1f0ca28b3f10ee2fd6896e9a13a96

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