Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ff32a28fdbba1f…

MALICIOUS

PDF

68.9 KB Created: 2021-03-16 09:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 08e0105d2d06c9299674242888f49ed0 SHA-1: aa30cb44fe2f464f4893ada5ce25480ce850ca32 SHA-256: b5ff32a28fdbba1f5d91f00d0442b383ebcabca3b61ecd72d63b7a1007336705
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and contains metadata related to its creation, but no clear textual lure was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/wix?keyword=little+tikes+toy+box+bench PDF link annotation
    • http://tuimag.ru/ab_initio_etl_tutorial_for_beginnershp46c.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/nexipatikoximunixekefuzij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_5ff27358d22cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5ffa8e31e88d6.pdfIn PDF document text
    • http://legendbilisim.com/50894707863lqhs1.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/how_to_use_blender_for_roblox_gfx.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/how_to_write_a_good_interview_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_6015558cd73f1.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/4195826004.pdfIn PDF document text
    • http://vamonaxegijugi.22web.org/as9100_rev_d_training_powerpoint.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/bexezamej.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/31980983533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_6001027399554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filosoko.onlinewebshop.net/iso_9001_version_2015_audit_checklist_xls.pdfIn PDF document text
    • http://verekoxamokit.epizy.com/32915180507.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_39c2d1e16fa94b8ea1383d11d3ab4d7d.pdf?index=trueIn PDF document text
    • http://toralixeg.rf.gd/2nd_conditional_exercises_with_answers.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_5b95dcb92f054a54b77ceebabf044448.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_0cc2e1dc25ab421fa14ae82d8cc065fd.pdf?index=trueIn PDF document text
    • http://mipagolawalixa.onlinewebshop.net/financial_accounting_theory_7th_edition_solutions.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/marksheet_format_in_excel.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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 4896 bytes
SHA-256: b39e580f1dc240713c3e05875a6d0f8c5a33cbf05f520c34b51457e243ad0129
font_01_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 10236 bytes
SHA-256: 0ba6970d97cc72c1e308ed7644739987fbdcb06952c56b93c737cf1c19355228

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