Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92af624e45e4adf…

MALICIOUS

PDF

79.5 KB Created: 2021-02-15 21:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0155d5af42d850780c9f95f1dc268276 SHA-1: 7d636507736c557c62451d74c3898d9d97ad9600 SHA-256: d92af624e45e4adf35c21794f6b697e038385ef914a32b42d15d8a7adf47bdb8
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics, including brand-impersonation credential phishing and a link farm on disposable hosting. The ML classifier also assigned a high probability of maliciousness. The document likely serves as a lure to trick users into clicking on links that lead to malicious downloads, impersonating Microsoft to gain trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/636829.pdf.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=toon+boom+storyboard+pro+20+v20.10.0 PDF link annotation
    • https://cdn.sqhk.co/takivelalam/ixt3HiJ/xinaxunuzobavutevit.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/636829.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/Y9A3ZY5/sovuturisasodefi.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/1172633.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/edb02.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/hhjfYuW/3m_post_it_notes_for_desktop.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/2f76593e25.pdfIn PDF document text
    • https://sudopefizumizer.weebly.com/uploads/1/3/1/3/131383323/zikokit_juder_kabaxupu_rokadaso.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/lasobelebupur.pdfIn PDF document text
    • http://raderojazoz.iblogger.org/briggs_and_stratton_lawn_mower_repair_manual.pdfIn PDF document text
    • http://patolul.iblogger.org/49034299652.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/nukopij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://folilef.rf.gd/arcore_1._2_apk_mirror.pdfIn PDF document text
    • http://pitugozuput.epizy.com/kuvufexugofilurafeku.pdfIn PDF document text
    • http://jilovin.epizy.com/muwobilakemuxezabowuruma.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/jezuvizamewi.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/gifupa.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/90428699801.pdfIn PDF document text
    • http://zesuzirer.rf.gd/mathematical_reasoning_notes.pdfIn PDF document text
    • http://kexeban.rf.gd/7458294920.pdfIn PDF document text
    • http://javajese.epizy.com/income_tax_reporting_portal_insight.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5304 bytes
SHA-256: f7c99b49b535adcfc7a1c3eeb46a805d7038ee7026bf4073aa7246e188ef6067
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 10520 bytes
SHA-256: f41ac237c0e438dd5bee358742b32e663c0f9e7ae8e3dd64b9245d75401f9592
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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