Malicious PDF — malware analysis report

Static analysis result for SHA-256 671b3d55be6c0aae…

MALICIOUS

PDF

67.3 KB Created: 2020-12-04 09:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e700fbdac6eeecebf04d6c1473f0c91b SHA-1: df7436490828b75686164454a0fd160d4e7ef20c SHA-256: 671b3d55be6c0aae622405a1c49283e7b7529ce538412e97366c813fd9053611
164 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. It uses an urgency-based lure. 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 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=thank+you+notes+after+heart+surgery PDF link annotation
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fa020a7246de.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/2bf65e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_5fae9e7fcadd9.pdfIn PDF document text
    • https://lopetumidola.weebly.com/uploads/1/3/3/9/133989387/5085737.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/keripabomodepedi.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4056517.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/nasujotater.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/bijodozewovojedun.pdfIn PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/gunojen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc2f5bb92c50b1a1e84fb95/t/5fc50a525147b14804d19d71/1606748755604/36995444950.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc185bea8793968640cb600/t/5fc52b203f75b166437a4a8d/1606757152258/metodos_de_separacion_de_mezclas_filtracion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bdc717e7202640e9644a/t/5fc1287861e25426e1619d38/1606494339289/3195661355.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe24709ee0f32b871cf210/1606296697572/82966730921.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10523b8467722f1d4eb82/t/5fc4c00d7acac6192a56bf7c/1606729741825/cen_tech_pocket_infrared_thermometer_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c6a4a87939686407af5f/t/5fc0e87518e72e5fdbf890e3/1606477942803/wokasebezexin.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_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 5112 bytes
SHA-256: 8bfe70b9e04e74173e0a2db1b1f8a72f30cfbfdb5a5c1eae29203e4081b1e1c7
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10072 bytes
SHA-256: ced287bdd061a7957aa533a5ae59d5a25616851d81b1dbd771f1be9db93d6753

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