Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e24b0f8100c2e9…

MALICIOUS

PDF

40.8 KB Created: 2020-11-09 13:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 679353fca011e4f7ac1e162d04bd654a SHA-1: 9a56dbcabf4e9fac12dceac42b3881d41704cc1f SHA-256: c4e24b0f8100c2e901ef0da3519c82e63a7ff6a268f0f2dfd8ed0f35889ae6f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an intent to redirect users to potentially malicious content or for SEO manipulation. The presence of an embedded URL also supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafftec.ru/aws?keyword=clark+creative+education+csi+answer+key PDF link annotation
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/jujajevuvolowojo.pdfIn PDF document text
    • https://zitofizifejiza.weebly.com/uploads/1/3/4/7/134706741/pifamikulevomifirow.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/devupez_fomusuguweteba.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/90d8c0e.pdfIn PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/fikanapokaju.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/dunumenekide.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/sipovaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c261b5d-74fc-472c-9f44-e6e1dff142af/rangiku_matsumoto_new_look.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babb84c1-604b-48ec-b837-5cf8d133d3e5/projeto_carrinho_de_rolim_com_volante.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368ca338-c352-4ca5-a45c-439c06e920db/colligative_properties_pre_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0615ec19-3d49-4d8f-af6f-b3bc2b018c35/buwipopodifozikopemovadig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e399a65-0348-4a35-8fed-d5d290df70df/beiimaan_love_720p_bluray.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/28806414357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1e39b0-8d77-475e-8d8b-264928a1062a/84867101119.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_off00005e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 5156 bytes
SHA-256: b4814ebc24ffca8bd2b432f79fe3b45b7b57942922c200f12851273a4854c8c8
font_01_sfnt_off00007046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 10948 bytes
SHA-256: af8dbc6f6f446f37c22407af5805e57a9d5fa340a4fe8cfcd457c66a9721009e

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