Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8ba376eed48d12…

MALICIOUS

PDF

75.5 KB Created: 2021-03-29 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 15fedf21668230a2da0f73f0ba2e1b23 SHA-1: 903ba43735e4670319fe75de1fbb137a0bb9e627 SHA-256: de8ba376eed48d123afd4c61fac780042cdb91b0ba49109f2d9331cea06ecedc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://mezovuduw.ru/strik?utm_term=how+to+make+a+rainforest+biome', is likely used to redirect users to malicious or phishing content. No scripts were extracted, but the PDF structure and link farm heuristic point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+make+a+rainforest+biome PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406208/normal_60329dd55dad5.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/jieXOH7/bisebeginegixig.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/lipivulip.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/c2gfgfK/light_up_pj_mask_costume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fea42e560dee.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/4d8b2dce98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6052e4735b5aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5fd7d3f93366b.pdfIn PDF document text
    • https://dufurewamefo.weebly.com/uploads/1/3/4/5/134595550/tevedubulupe-dabejaw.pdfIn PDF document text
    • https://zevupizufaf.weebly.com/uploads/1/3/4/3/134315684/jifeneri.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/Y3hapig/echo_voice_recorder_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6010c2f4a45e7.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/d384c883-8d26-4555-a989-0bc1889428dc/7152274306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e4a70f-9cca-4623-9224-6d816c911e80/27117882510.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/course_attendance_sheet_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16109050-5afc-4577-a5b9-cdce61bfefa9/nuvalidefoz.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/epson_wf-2630_printer_error_0x89.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0209c9fd-61c4-4898-b2f9-3c043b2ab19d/everyday_use_by_alice_walker_discussion_questions.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 5140 bytes
SHA-256: 271a79db9094648fe539a0f4d5f09d02f0fa92231167f45914b6273e418dd48f
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 10068 bytes
SHA-256: 8e0b5d9ded06c93ee0d6a3bd721dfaaa3f7c8169a4527ab0eb0f655cc3ac4a2f

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