Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eb65685ea3afd7…

MALICIOUS

PDF

78.7 KB Created: 2021-04-08 04:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c95b1b7637891e35e325451a20dfb55 SHA-1: b1e4d1431eb295b42765b483047ae97f58361e9f SHA-256: 16eb65685ea3afd7183c7be6ea00030109e3ec8e67b5cfa3655df6ec47e1883a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=main+characters+in+act+1+of+romeo+and+juliet PDF link annotation
    • http://forisawidokomor.sportsontheweb.net/multivariate_gamma_distribution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_60617dbf5294c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fc9692246f81.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/41849479225.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/lelirinajikepunutopajuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_602ab9ab2c390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_606c487d50a73.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/44422739982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470207/normal_6069e093b6f96.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/42262228543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_a078e6a3e4c34988b4a3a852768db061.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/how_to_put_google_play_on_amazon_fire_tablet.pdfIn PDF document text
    • http://kexomun.myartsonline.com/clinical_chemistry_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/vekutoke.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/international_law_firms_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/chicken_invaders_2_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/torakejomizotemaluput.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_8fcb38c788b4467aa0d15d205201ed87.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_fb9142f6e1b54f35b574853b0096a96e.pdf?index=trueIn 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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 5392 bytes
SHA-256: 788b819f44ed719321c7dc525fd0c78d01d8de0b1149ff853dfb04c4220a13fb
font_01_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 11172 bytes
SHA-256: 95eeefa8fdc6a221a5b382e7212227f51f0728e5db8fdfbd68c9f16e5c622ceb

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