Malicious PDF — malware analysis report

Static analysis result for SHA-256 9946b8832704ff3b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-06 05:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aef793fd316b456abdf3bb831acc285f SHA-1: c2b0b10f178c3c2e65727e7dcef8704ba78651e9 SHA-256: 9946b8832704ff3bd89738d66580a1290103633fcd4c08dd2cebd677d8fe14f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9993

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 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+make+homemade+jerky+in+dehydrator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499622/normal_5fd19ae8017ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_600c62b1ac65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_602df3d422f28.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/3339815.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/71614465606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_600f2ac736ed1.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/99503351644.pdfIn PDF document text
    • http://zozoriba.iblogger.org/athletics_merit_badge_worksheet.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/sadaluzutag.pdfIn PDF document text
    • https://bojemesazam.weebly.com/uploads/1/3/4/5/134598919/7529788.pdfIn PDF document text
    • http://pipawopozovifo.iblogger.org/3357284581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fe5571a7951c.pdfIn PDF document text
    • http://rumepado.mypressonline.com/einstein_summation_convention.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/kijuvifovinagebivebekegaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456660/normal_600059b2cb9db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fdb905d5d19f.pdfIn PDF document text
    • http://banujal.iblogger.org/jaxalilufelabulomofexeraj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/86952594843.pdfIn PDF document text
    • http://nekonopevijaj.rf.gd/63261078661.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/audio_books_for_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/gakeretowafe.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/intermatic_ml200rt_timer_not_working.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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 5148 bytes
SHA-256: d47463a72b526106d0227ada79366f1f0a3b45696f3f01705b2d7962cd50752b
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 11760 bytes
SHA-256: fb1b91a69201114bea5b2618b8abcb9b56e9fff97d758ca5a762e37949e6f347

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