Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e41d33f42a06de…

MALICIOUS

PDF

78.8 KB Created: 2021-03-15 19:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d03bfa239dcae8961c75df45c6872072 SHA-1: 87f5db7b3933e6a38062fbbf2c6c14943175dd26 SHA-256: 53e41d33f42a06de8311a4a3a9d535bb62f40e8762e4812e0dd79ceb6b196141
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-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://jumiwimov.ru/aws?utm_term=brene+brown+shame+ted+talk+worksheet PDF link annotation
    • https://patufefuwo.weebly.com/uploads/1/3/4/3/134312622/tesiserinebowuxof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_6005e828bc851.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/16c1cd3be10bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412592/normal_5ff2cc989d4be.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/hfZhijj/sony_android_tv_kd_55.pdfIn PDF document text
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/02ef8b247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5ffd4c10116aa.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/5771184.pdfIn PDF document text
    • https://jojesiwanoj.weebly.com/uploads/1/3/3/9/133986560/kaxafak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5fcb01a95ec66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_600fce4e6a03a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fec0c4c7de9f.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/gRiifgc/jerotinatexoral.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://penonas.epizy.com/xarokurofipi.pdfIn PDF document text
    • http://kisoperut.rf.gd/xizirixirado.pdfIn PDF document text
    • http://varitumowu.rf.gd/beyblade_burst_evolution_full_episodes.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_3eb264cfd4784fd49e9ec291b9d60a35.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_709a04142e1e4c73a8554fb545de8b05.pdf?index=trueIn PDF document text
    • http://xolemobubusosi.rf.gd/banana_chacha_ringtone.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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5412 bytes
SHA-256: 27131506eac5c41e2935b7b04481665b24e1a8ef36141c9ca9d213c6539e1ac6
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 11456 bytes
SHA-256: ae10b626476266962ae689450b6fe60b7638797f4dfa264995c58ef2d23fe11c

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