Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef966c9df356340…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 12:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 026c372402064ecc36c453e771b129ab SHA-1: dc01f3e251b7537b6d4310ec5656496923194dc1 SHA-256: 4ef966c9df35634009ca70b9dec6e5da097e5725c2f1bb30eac14724758317c9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to reference a book title, likely a pretext to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=murach%2527s+html5+and+css3+4th+edition+pdf+free+download PDF link annotation
    • http://mutomew.22web.org/2427070942.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/joe_vitale_hockey_sidney_crosby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_6046de82e8f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60188d4ace167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_603ff0559b78c.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/96414100582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_5fc85040dd355.pdfIn PDF document text
    • http://xejitifuwoligaf.mypressonline.com/bijapopixelawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_bea08f55ee244671917530e130dec09d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/unstable_angina_aha.pdfIn PDF document text
    • http://ramasewo.epizy.com/daily_expenses_excel_sheet_template.pdfIn PDF document text
    • http://junamatodomuwip.rf.gd/lezibulogafisalar.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/72574339550.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_fb3e4be445a74383871c01011a8d5428.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petikamov/credit_karma_uk_how_to_print_report.pdfIn PDF document text
    • http://budobilososuw.rf.gd/98408467451.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_9f376c88aabe420b9a3e7a19a71749f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/project_report_in_entrepreneurship.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/52204594263.pdfIn PDF document text
    • http://noxezuga.rf.gd/38817758194.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/antivirus_smadav_free.pdfIn PDF document text
    • http://gebopotaxe.rf.gd/22384868373.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_1992efaaa7c440ebaf0e125f3c647c7b.pdf?index=trueIn PDF document text
    • http://miganuvag.myartsonline.com/32671645407.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5900 bytes
SHA-256: 1f37626fba8a3df5154908abf6f22dc3e3878c2c9d5b0dccc65331d209bf6719
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 11108 bytes
SHA-256: dd01481445cc0446763a649f08e5d6ccd02477db1af7ba1a280c59517e246e51

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