Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a3735526744e40…

MALICIOUS

PDF

67.3 KB Created: 2020-11-13 01:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 66da6db43c53293cfb7dcc5e0e6d66dd SHA-1: df41fe1c6ed97c35df9eefe7adab9606b7a6b688 SHA-256: 08a3735526744e403af4bbeed6dec39d77a190c47020778c0fcdce6f315d5a54
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://traffine.ru/strik?utm_term=basic+setup+for+dental+assistant PDF link annotation
    • https://sebijulevezokoj.weebly.com/uploads/1/3/4/5/134512917/josulefor.pdfIn PDF document text
    • https://tavikumor.weebly.com/uploads/1/3/4/4/134476146/fafopobas.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/vizaxe-zavagotapalevo-wujijodimunimet.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/8483773.pdfIn PDF document text
    • https://votixired.weebly.com/uploads/1/3/4/6/134633812/411dcf5.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/aa20c2ef-5b38-45fc-bda4-7c69de3bcdd9/waguduxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0c0691-b7db-4124-a2b6-d74177147b4f/72261729737.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/adobe_reader_10_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/state_of_tennessee_separation_notice_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/78694145237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1646342-d3ba-48d9-b1a3-2f8edbeb2353/ginidozumikuleranemekote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1580a5-ed0d-4d64-87d1-a2628a25f667/75432759379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9481345-4dfc-4987-8f2a-3f0492ec5115/stoichiometry_limiting_reagent_worksheet_with_answers.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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 5200 bytes
SHA-256: 999652f0d9b9aa4ca66bc000a5908418c721bc60eb7da677d4caadccd260a141
font_01_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10160 bytes
SHA-256: ff66a973c4378679985d16dddc0d327124dd1f64c561f8ebe24d5277f029f41e

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