Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce78fdb3748fecc…

MALICIOUS

PDF

73.3 KB Created: 2021-02-09 00:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d46477838c4a942300b878577242e956 SHA-1: 30b79b09aa66b6a1302d8cd8d44d1b6d67a32205 SHA-256: 7ce78fdb3748fecc85b5759b34f5a2b78463ff62bcfd7e8a6d8f284fd747db8f
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for redirecting to known malicious infrastructure and a high ML score. The embedded links, such as 'https://yafferge.ru/wb?keyword=celluloid%20malayalam%20movie%20songs', are indicative of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • 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://yafferge.ru/wb?keyword=celluloid%20malayalam%20movie%20songs In PDF document text
    • http://demask.space/11433185563gaa38.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/zujutixavixamar_fanarul.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/xiniset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fd64f80ddf10.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/fuveratopirexewizaz.pdfIn PDF document text
    • http://znalomstvavip.site/prison_break_vuelve_a_netflix_2020gzu52.pdfIn PDF document text
    • http://marketeuro.pro/46810978554qhlmn.pdfIn PDF document text
    • http://exampl1214.com/463613034895x0s5.pdfIn PDF document text
    • http://mexicotop.xyz/wapopidudujr3bl.pdfIn PDF document text
    • http://quickpapp.online/1450900349583a24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_5ff56cea682c5.pdfIn PDF document text
    • http://vizionsmc.net/iphone_assistive_touch_apk_for_androidqp3c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_60197850180db.pdfIn PDF document text
    • http://construt.site/wish_app_cart_not_working78x7o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwukimip.epizy.com/lokerogaladedivazevudi.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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 5116 bytes
SHA-256: c506abbc08d9cca79b9159736cd10b229590de91c5577019500ea2e039fb1958
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10580 bytes
SHA-256: ccf8192077fe1a871b185850aecd5384dc7a6a815be60af6c6d5f5a6c667daac

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