Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1ab53cae3a5979…

MALICIOUS

PDF

71.3 KB Created: 2021-03-25 21:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 957a2e96803e0cf2a244eb9c88d77b54 SHA-1: 238f7146d5a68319c169db8527b3b1d869d56d5c SHA-256: 4b1ab53cae3a5979c720d3f8f5e7ec733130a5fa260b415c00787615babf86b0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, https://yafferge.ru/strik?utm_term=stihl+ts+400+carb+settings, which is disguised as a search result for Stihl TS 400 carb settings. ML classifiers and ClamAV also flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL strongly suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=stihl+ts+400+carb+settings In PDF document text
    • http://d-youtube.com/moganerurujezidijovegapoinhpe.pdfIn PDF document text
    • http://dalnoboyi.xyz/4737825572swz6t.pdfIn PDF document text
    • http://zijogodakenanaf.22web.org/asana_meeting_templates.pdfIn PDF document text
    • http://beliyden.xyz/69878890586eqgso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xubifupi/allah_ke_naam_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/sukudazodugedodinilep.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/15587588098.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/96645304822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230d4ce7-5565-40c3-b984-1ed4489a132b/89232618742.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/robunabo.pdfIn PDF document text
    • http://kenumubozejofum.epizy.com/83929656796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f77b98b-38ac-4be4-b422-3b7cba1532ce/70503268180.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/ecco_guidelines_crohn_s_disease_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/bestwap._in_movies_hd.pdfIn PDF document text
    • http://wixesikive.epizy.com/xebonudamonasodevugan.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/87588402638.pdfIn PDF document text
    • http://lobunuwofapow.rf.gd/grade_1_phonics_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/jepoboxoliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ff4f03-4d04-4504-b710-166363afeba4/ben_10_games_free_download_for_pc_full_version_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/non_occupant_co_borrower_fha_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/66362863509.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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 5536 bytes
SHA-256: 7ef448e890e4b252be6cd742316d559d63340cf3d31388d755ccba47debc1b50
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10644 bytes
SHA-256: 287b93954758328883afe6da7cc334eff80d6ea39ef7dbb0d872e92e65cf076a

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