Malicious PDF — malware analysis report

Static analysis result for SHA-256 9424c4f16d825c72…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 23:00:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532484749418df7f68270b2970da74e7 SHA-1: dfcbd87ee35950acf61e6e1dd30fe689b0c43e17 SHA-256: 9424c4f16d825c72411e07af5eb02227f3feff991177f88c450f84960e9d7b22
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to educational content ('transforming parabolas worksheet'). No scripts were extracted, but the presence of an external URI and the overall detection profile strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://pelibifir.ru/wix?keyword=transforming+parabolas+worksheet
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5ff0d675b93be.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fceceaf69728.pdf
    • http://vekogevev.22web.org/fusiposivazelotu.pdf
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd661013c96a.pdf
    • https://cdn-cms.f-static.net/uploads/4469116/normal_601739484d9d3.pdf
    • http://seluluxafej.22web.org/belkin_n300_router_setup_software.pdf
    • https://cdn-cms.f-static.net/uploads/4420245/normal_603d34d6bcf3d.pdf
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fddbeb528ac7.pdf
    • https://cdn-cms.f-static.net/uploads/4487186/normal_5fd2c0453907d.pdf
    • http://katorewudejizut.22web.org/apmops_2016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jupudizadid/gmail_contacts_to_outlook_2010.pdf
    • https://s3.amazonaws.com/bubodeliza/cms_ka_full_form.pdf
    • http://bakenexiradofo.epizy.com/assistive_technology_fund_form.pdf
    • https://s3.amazonaws.com/midipes/old_nurse_uniform_costume.pdf
    • https://s3.amazonaws.com/nokiva/rabovilaxejirivizuz.pdf
    • http://vulomalizekuvu.rf.gd/how_to_start_an_ebook_library.pdf
    • https://s3.amazonaws.com/xufujofaleki/medical_bill_credit_report_legislation.pdf
    • http://levuvov.epizy.com/blest_be_the_tie_that_binds.pdf
    • https://s3.amazonaws.com/wamatasamegu/how_to_get_fit_without_dieting.pdf
    • https://s3.amazonaws.com/jemisajoda/wipixikixedariz.pdf
    • http://kizifisen.rf.gd/55936563441.pdf
    • http://nilidax.epizy.com/ragebisexi.pdf
    • https://s3.amazonaws.com/kukupunopedon/giruwovugidumexejobijip.pdf
    • https://s3.amazonaws.com/zevutebulaworel/18606060878.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/janatha_garage_songs_in_sensongs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b8.bin
80f07314e2ecb2873370f0f2da1dcbef4970b1aa58fec8ae6e23bc1b6db305d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 5560 bytes
font_01_sfnt_off00010484.bin
60ec58ba39afdb5299468f14cdd7458472da5cdd5a2e219efd684fb3cc04c1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10804 bytes

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