Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4142ab4d6152e14…

MALICIOUS

PDF

72.6 KB Created: 2021-02-14 09:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb0c1c23939ac4c3cbd61ee16e5e58c6 SHA-1: 2b74432807c3aa65d3f5bda8a2c71ac2d18907bf SHA-256: d4142ab4d6152e145ff56995fa380b60a934e14a360791a60e66debabf2ec831
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=avid+interplay+engine+administration+guide PDF link annotation
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/7110759.pdfIn PDF document text
    • http://misudijawalezom.22web.org/photoshop_cs5_with_crack_free.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/x2hiWii/7811638157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_602270f42e2f9.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/FggDij4/celebrity_cruises_nz_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447101/normal_600754c23ae2c.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/N8Ijhje/36703656640.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/gtjjtdC/48626838140.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/gjTGDYw/setexojusufesobew.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/ib1ggfI/58858669912.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/xixonu/xivepaferiniw.pdfIn PDF document text
    • http://folujas.epizy.com/cigarra_e_formiga_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/asca_lesson_plan_template_example.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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 5432 bytes
SHA-256: 795ddf7541e4e63a246a4e9e76b01360c009b543e99ac4f37c5887f20e1d99f8
font_01_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 11336 bytes
SHA-256: 86b94e0337466bed08d4ca2c3973f8335985507176f13f22b915a236f3f345fb

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