Malicious PDF — malware analysis report

Static analysis result for SHA-256 88043b20d7ae20cb…

MALICIOUS

PDF

71.6 KB Created: 2021-01-10 13:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 98e6076b56284435519de33653ff173e SHA-1: 5630e2f9ff6b8980b9b1d466a4accac47a5db9ed SHA-256: 88043b20d7ae20cb8b867fc87adff6657891949bb2b20d042ced2cafcde735a8
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on link farms and redirectors, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a recipe. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wb?keyword=receita%20de%20glace%20simples%20e%20facil In PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/zugabuwurupara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_5f9ef6cfd7831.pdfIn PDF document text
    • https://simovisebosa.weebly.com/uploads/1/3/4/6/134649932/pokezadikasumum-betizuzelel.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/1305251.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/352e88842af0a67.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/igrjahh/oceanhorn_2_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/3hijajg/welezidudekuzimijexuzoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fe68b401b918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5fae635cdefa9.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/xosomo_xatawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 5384 bytes
SHA-256: b717f783be08324b7d1e20656e5fd9e99409fa4eb45f4e712bf58be71dbd8d2c
font_01_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 12184 bytes
SHA-256: e31e7fff309e43cc6ff99ca542949cd72f57b4d0aff1ca3c77a6c96d271e56f2

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