Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cec5097a6376b1…

MALICIOUS

PDF

70.9 KB Created: 2020-11-27 10:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 57109c00deaef692fd835909c132727a SHA-1: 6dd3502c00f1c020d25cc4c57eab4c53706b7883 SHA-256: e5cec5097a6376b1685569e207e1f9c54dde2a0db88a6c6216c410cb2017cd71
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Craig huey voter guide 2016 pdf', indicating a lure to disguise the malicious nature of the links. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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 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.
  • 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://traffking.ru/strik?utm_term=craig+huey+voter+guide+2016+pdf PDF link annotation
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/sometevifum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_5fb686ad18634.pdfIn PDF document text
    • https://jabudebixeref.weebly.com/uploads/1/3/4/3/134398441/6612576.pdfIn PDF document text
    • https://tewodoxes.weebly.com/uploads/1/3/4/3/134368692/50d753.pdfIn PDF document text
    • https://vagipirisixo.weebly.com/uploads/1/3/4/8/134861957/b465857791.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/terode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f8f69db9deae.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.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/welutizenop/xonenuxatud.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/super_mario_flash_2_unblocked_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/zombie_catchers_mod_apk_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/agri_fab_lawn_sweeper_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9bf283-ac4c-48e7-b2f6-5222af6ae9ce/sejixim.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/schedule_e_2018_form_1040.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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 5640 bytes
SHA-256: 0dac34aa48f94af1ce3bad39ad04126e9de925288841417a3e6a90aa8fed4e97
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 10992 bytes
SHA-256: b643483f6bcef844e3b36212b16803298958de9b8ddadb1e80f58c8f67fee48a

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