Malicious PDF — malware analysis report

Static analysis result for SHA-256 c225520f520089fe…

MALICIOUS

PDF

70.7 KB Created: 2021-06-06 11:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0b5f1d2392f1739dfd14379931161300 SHA-1: 66550a6f4b2a268b1e130ec342f430207a330c5f SHA-256: c225520f520089fe1b65eaaa8ea1c53d36f3dec9134c83d1568a76e390eeb9da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/123?utm_term=interval+notation+worksheet PDF link annotation
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/kikokitemujo.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/daxubajiwupotuxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fd1366ede5a8.pdfIn PDF document text
    • https://taduravepe.weebly.com/uploads/1/3/4/7/134714340/bapigetuj_bupaweno.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/fidaxejafexunaxap.pdfIn PDF document text
    • https://pegejajala.weebly.com/uploads/1/3/4/1/134109309/tesawapezob_xexazulolezar_beruxenoki.pdfIn PDF document text
    • https://wefanuku.weebly.com/uploads/1/3/4/6/134611064/terorodufaferos_kijina_zuzal_sukaketep.pdfIn PDF document text
    • https://jubabanijawema.weebly.com/uploads/1/3/1/0/131070146/3185498.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/wajogivuwedisawofub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5ffc66200a37a.pdfIn PDF document text
    • https://midunufi.weebly.com/uploads/1/3/4/3/134387712/pawafiludolig_pobaniro.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/kebovotimiviko-xilar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408881/normal_5fc6245ab8ad7.pdfIn PDF document text
    • https://gedorizifoxe.weebly.com/uploads/1/3/1/6/131607240/simojewimorovazur.pdfIn PDF document text
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/04f44a4c87fa00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fec1dcecb4c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5ff3762ce4ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_602070eaeeca7.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/2db6d17d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_6053995464968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_603e77ab4960d.pdfIn PDF document text
    • https://sokegipamemaxo.weebly.com/uploads/1/3/4/3/134345901/topikami-pupexukudag-rubuge.pdfIn PDF document text
    • https://likudone.weebly.com/uploads/1/3/4/6/134681098/dutamazigap.pdfIn PDF document text
    • https://merasezimimuzal.weebly.com/uploads/1/3/7/5/137510453/valagaxep.pdfIn PDF document text
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/jadaxa_falogulozuw.pdfIn PDF document text
    • https://jixerunoxeza.weebly.com/uploads/1/3/4/6/134678785/mupupo-tijuzeporedunej.pdfIn PDF document text
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/11291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_604666edd996c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 4928 bytes
SHA-256: 9ceba5d00cafd438e4f1232403a72e7f0cada0c01545a56feb04428e19604ad8
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10336 bytes
SHA-256: 635b04ab17076f400d79d57592c161fe77c370a02fe8b9b0f5d998153ee3e67c

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