Malicious PDF — malware analysis report

Static analysis result for SHA-256 18051b5038823d6d…

MALICIOUS

PDF

74.4 KB Created: 2021-02-15 05:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c95fbd90b967c4d92de5b012f0b126e5 SHA-1: b4e11bcacd36d8b46de7f25a3256af9e7d0b67c5 SHA-256: 18051b5038823d6d11d819172aa184300157355a2780d3a32eecb2a1fa4cfa98
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links, suggesting a link farm or phishing attempt. The PDF_URI heuristic further supports this by identifying an external URI, which is likely used to redirect the user to a malicious site.

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://druttle.ru/wix?keyword=mr+coffee+easy+measure+12+cup+manual PDF link annotation
    • https://cdn.sqhk.co/jekunesoru/jieRjhj/50203526100.pdfIn PDF document text
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/327db9f6.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/4068976.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/jRVjbd6/movie_maker_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/jifjjhg/43212162007.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/4inTMgf/rowaxojed.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/vifex_semapas.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/bgfugKj/prison_escape_walkthrough_level_9.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/bTidiak/minecraft_pocket_download_apk_0._14._0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffc23903e92b.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/dDhwhjD/71857818224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_601cf71a680d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nagev/answers_to_difficult_behavioral_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/xevepesejarunim.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/autumn_border_template_free.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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 5452 bytes
SHA-256: 59a0b9448ae2017aeb03c75e8d5300877d9b91ec2ba88680eb3e94caeeac0dfc
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 10212 bytes
SHA-256: 8c2b4833be73b23e1b8c2d8201b699360cd3a3ac4e0820d0666ca4f74e88abd1

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