Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e73f67457e9842…

MALICIOUS

PDF

67.6 KB Created: 2020-12-15 21:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 066b8d6f0f52ff2b85c2ba5416b04263 SHA-1: 310376f73965f59d14fd34e860faf1c15b12cfcd SHA-256: 28e73f67457e98421a0b6cd09ba898a5e16b4e0fc2b3d958fbf5ca37d67d8bf0
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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 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.
  • 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://cctraff.ru/123?utm_term=curtis+wall+street+carroll+net+worth In PDF document text
    • https://muwudenejudazo.weebly.com/uploads/1/3/4/6/134677543/gewatubotaw.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/9627545.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/6042198.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/xorateduzisunel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fd0671471e56.pdfIn PDF document text
    • https://lasaveba.weebly.com/uploads/1/3/4/4/134488520/lozagukuvodewakabad.pdfIn PDF document text
    • https://nekewagan.weebly.com/uploads/1/3/4/8/134881830/midimuzaxa_kidilinutulolum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5f9729695e1dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f94ff2f4f19e.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/a02fddc7-d8f4-4ed7-be98-5273039f243f/rusosasidaxugexoxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f1fd93-3c6f-45fe-9c70-fa0971a7342a/90557541597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecf4e84-e707-443f-a69c-e625bdcd05ee/54350234152.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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 4884 bytes
SHA-256: 4c1e1a9c1200bae3cede24d940771a2d9a347cf6724100002572e0b8fa7cd552
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10948 bytes
SHA-256: a6c8682c665d500e0074f713a95d08ec22a515fe73d49027b2757f478dbec726

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