Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8283e79c8d8d249…

MALICIOUS

PDF

75.9 KB Created: 2021-04-07 10:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45dd212350c6697584ed9aa695e3bd91 SHA-1: 90905486cb69ceabec2bbb6c1a8c719aa0c76164 SHA-256: c8283e79c8d8d2495382bc231ad88b747a617d72d895585bfb6175264be14348
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://dafemum.ru/strik?utm_term=2001+e320+service+reset', are designed to lure users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest an intent to facilitate phishing or malware delivery.

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://dafemum.ru/strik?utm_term=2001+e320+service+reset In PDF document text
    • http://hotsales-com.xyz/pawaxejigugor1e9y2.pdfIn PDF document text
    • http://tijevuwotej.22web.org/satijuvizigune.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/UB3gdrP/xifinitip.pdfIn PDF document text
    • http://submonster.xyz/weber_gas_grill_parts_amazonrwv0m.pdfIn PDF document text
    • https://cdn.sqhk.co/nakokixega/jbs1Ugj/jiffy_lube_oil_change_expensive.pdfIn PDF document text
    • http://stroy-level.ru/how_to_fix_panasonic_inverter_microwavep7x0u.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/imKxY3P/risodobexanav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_6067beae1ec0e.pdfIn PDF document text
    • http://christinaanddavid2019.com/xoxezirebobuxabebogejfqon.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/ghidTib/solulotononam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fe02a94ae8d9.pdfIn PDF document text
    • http://lessonsonline.site/what_are_the_5_elements_of_a_storywpdi1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390643/normal_5fdfba6856b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_6049055908535.pdfIn PDF document text
    • http://filexupop.iblogger.org/46360040830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kawalupuzode.epizy.com/conditional_operator_in_c_example.pdfIn PDF document text
    • http://suvubojetixag.epizy.com/47584099079.pdfIn PDF document text
    • http://gigitepusiligo.epizy.com/netflix_pro_apk_latest_version.pdfIn PDF document text
    • http://wuvasof.epizy.com/business_analytics_syllabus.pdfIn PDF document text
    • http://buvozosasubatib.epizy.com/colonoscopy_screening_guidelines_singapore.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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 5004 bytes
SHA-256: a058f40e9bc9c66d5f059caee8a4a81bc8471b72524b920e236d86bc28f1a983
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10756 bytes
SHA-256: bd3b3a417b4892a4e8750a5186735e7c802720a6772b94938e8e5315b68b6fdf

Open this report in the interactive analyzer, or submit your own file for analysis.