Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8989dc371f5520…

MALICIOUS

PDF

87.1 KB Created: 2021-03-25 10:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0366054409308e7f2aaa043d4f124e54 SHA-1: 16a86635df1b3f18e5b663b4c6405562fd7822d8 SHA-256: cd8989dc371f5520e34ceb2eb81617a35ce60219ad7cbbf70bb61acfc8c5713f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous external URIs and is hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'dryer thermal fuse' and application metadata, which could be part of a social engineering pretext to drive users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://midufefew.ru/aws?utm_term=how+to+replace+dryer+thermal+fuse PDF link annotation
    • http://distornyup.site/56575162038o59k6.pdfIn PDF document text
    • http://richteam.site/armory_v._delamirie9nllf.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/buku_agama_islam_kelas_12_kurikulum_2020_penerbit_erlangga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5fccde3682fcd.pdfIn PDF document text
    • http://scarcebook.com/tabla_de_densidades_de_sustanciasec28i.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/lukonuninomeviwufejz4p4.pdfIn PDF document text
    • http://trells.space/bepabiwolagafariwuzenafoywlev.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/mckeachies_teaching_tips_ebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_60267e0a8a1e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_60010e8a7a00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_6041554fc2920.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/56952227706i54i8.pdfIn PDF document text
    • http://motivawka.online/kenmore_elite_over_the_range_microwave_model_721v0oem.pdfIn PDF document text
    • http://lofokumado.22web.org/interesting_facts_quiz_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rurebirafana.epizy.com/kcet_2020_question_paper.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_320e4ed8532345cc8c8901ef4f40c7fd.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_013790e452394501b93c2c17312ab3ff.pdf?index=trueIn PDF document text
    • http://dagubumomoze.rf.gd/lg_company_introduction.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/career_after_12th_arts.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_93ba4c149bcb46028d1369385922a4d9.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_a52d059eeeb74bd0bfdc2bc5f869fcd8.pdf?index=trueIn PDF document text
    • http://kavejanunar.epizy.com/one_way_anova_examples_with_solutions.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_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 5552 bytes
SHA-256: 9e36900c807271728ce8997d82e36d227906089c314a8640c626e003f2d3b897
font_01_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 11332 bytes
SHA-256: 6680b67d29ddbcdc70810eddd695d95987ee0dddbb3d271a5d64fcd658786b89

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