Malicious PDF — malware analysis report

Static analysis result for SHA-256 e919bdf4f3d806ba…

MALICIOUS

PDF

109.2 KB Created: 2020-12-06 22:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce8467dfb80e7b9b462b936d16c5ba24 SHA-1: 78f79442aec2f5423849baa5cf0cc11e3b0e9b4c SHA-256: e919bdf4f3d806ba79b2e8158134b2fb4bf010cc765bab74cbb9b593c2267276
214 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious sites, specifically leveraging a search query for "Turn off facebook notifications chrome windows 10" to appear legitimate. The presence of a critical PDF redirector link and a high ML score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=turn+off+facebook+notifications+chrome+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fbae66befda4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f8f43aea6ff1.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/wegurifisuzanezepar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5faa38a0aa27a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_5fa2bf7914454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_5fbce6ad5f2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fb9805ea08aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5fa9d7084857a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bezorito/98614324749.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/decimal_addition_word_problems.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a00dd49dd124473946a2/t/5fc671421972c46e3c7c4b6e/1606840643248/loopstation_recorder_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d1f60a2757459b04aa97/t/5fccb6a7e43f2b00a8a4cafb/1607251626066/74427132871.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6f01bd8c365012834ab76/t/5fcbebbf551bdc47e7b6315a/1607199681099/stickers_cloud_sticker_maker.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5409b40f1034a5cc57798/t/5fc804ea6a2bd913a54f03db/1606943981140/63003599001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD8 5552 bytes
SHA-256: d16c8ea7dcd46cdc2d79a77146ba4ac75285e075c0bc9e65556b080db4b8059c
font_01_sfnt_off00016f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9E 12752 bytes
SHA-256: ef45004863c761bc0c3efed9f0257738a30f2edc5bff8f2fcdbe50c458fd9633
font_02_sfnt_off0001990e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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