Malicious PDF — malware analysis report

Static analysis result for SHA-256 393002e5630a3665…

MALICIOUS

PDF

102.7 KB Created: 2021-03-19 19:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a980641ddf8a9c80aff7a1441fa43039 SHA-1: c49c340544c27879fc85bfad9d3a32c851195e98 SHA-256: 393002e5630a36651c9742ad9a2b224bd2105a58583d8680229271d92475d177
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as part of a link farm and one specifically points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=wake+up+wake+up+the+time+has+come+poem In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_604cef77e7d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_604b89c97caa1.pdfIn PDF document text
    • http://qwertyujg.xyz/academy_stars_3_pupil_s_book5a722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5fc83e5728caf.pdfIn PDF document text
    • http://0fruits.space/how_you_deal_with_stress_interview_questions47ydc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_602864ef57ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_6021f8be0e98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_5fd90154c1c97.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/0b5d4e068d.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/nivevosotumedupoguz.pdfIn PDF document text
    • http://chelobaka.space/8063889319rob1g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6014c36946e71.pdfIn PDF document text
    • http://leopards.space/loan_interest_calculator_excel_sheet7xgvk.pdfIn PDF document text
    • http://qrastenmap.online/monadatizojufupajazm5g2e.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/3065820.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/computer_system_analyst_courses_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/bitdefender_total_security_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/way_of_the_wolf_audiobook_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/antivirus_android_security_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 5216 bytes
SHA-256: 74f8ff54a95aaa18d78a848f536a595831664cba97d3345e0b3d1ec99185f758
font_01_sfnt_off00014538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14538 13180 bytes
SHA-256: 44a730afe20b94e946fb128f45eac9dfca7b5be889cde4d6772501e6648eaea0
font_02_sfnt_off0001660c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660C 10888 bytes
SHA-256: f1c51f4adefd29ccf1cdeaf3d62af06f155e7eda095cc70e738fbf5a6d87ceea