Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e7f43bf572df99…

MALICIOUS

PDF

67.6 KB Created: 2021-02-26 11:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9a3ea7d317d02b6f3e503d72dba89233 SHA-1: 5480ab7baa5b586c215e23629a42133850844f68 SHA-256: 86e7f43bf572df992a0045bff736800e5c9b6073ce1c80695a3a650420d7e0d4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The document body, though truncated and obfuscated, hints at a tutorial lure, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=html+tutorial+in+hindi+part+2 PDF link annotation
    • https://pelixenebedevo.weebly.com/uploads/1/3/4/3/134338689/lelebusope.pdfIn PDF document text
    • http://renoxarogiguke.iblogger.org/refodudobugejinedup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60217e79dec08.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/luputopijob_wuxuz.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/40604922070.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/fazerevadapirek_sadotatolig_sixinisilepowe_revuv.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/2084848.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/94912400178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepizevut.atwebpages.com/39508057127.pdfIn PDF document text
    • http://tuzekesomumar.rf.gd/papa_phone_ringtone.pdfIn PDF document text
    • http://tesuzegijibonu.epizy.com/65929158334.pdfIn PDF document text
    • http://nenidexixod.epizy.com/vukawe.pdfIn PDF document text
    • http://jenigaseze.epizy.com/negative_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 5116 bytes
SHA-256: e37dd1ebfabe805bc32c6c75f88fca1cef92f19b5e0072d701b7e533b9ee044e
font_01_sfnt_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 9508 bytes
SHA-256: e42d0f35de4ff12b620b5b306417c01022a9143b5a7e05298150d85ea219bfa2
font_02_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 17016 bytes
SHA-256: b302944bf4b465e9ff55ed0a4c6a24247343d018d12d653abf3d1d1ae389fab2

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