Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fc2fb95c2ed8e9…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 21:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5e97d3a2fa5fe791bc1ca6fc6bf376a3 SHA-1: 8047446bd0a430d85d37d96cad806a0fa775b1cc SHA-256: d5fc2fb95c2ed8e9f45754d2d5c7b1fd5c226b1473697e1180ae7b8b09d5a1b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious external URI pointing to 'resalured.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to obscure malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://resalured.ru/strik?utm_term=brunswick+pinsetter+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6049105da3e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_602ef7259c878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_604e42bb47e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_60513ab0afeff.pdfIn PDF document text
    • http://bulewedulipofam.iblogger.org/bokanalekuviwalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fdc61111f0bc.pdfIn PDF document text
    • http://nevepojikita.22web.org/cavendish_university_courses_and_fees.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/80213268714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6009aa53c2173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_6060120d999f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_603f470f10346.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/d1b92ba3-af59-45b2-a076-3ca9b13f788b/sql_in_10_minutes_a_day.pdfIn PDF document text
    • http://rijowetunif.rf.gd/sujitoliwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe06ba2-c39b-4a47-acbc-d7be3191ab8d/54486958514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9cbc4e-7060-492c-b16a-b8e0f822b462/bhaja_govindam_lyrics.pdfIn PDF document text
    • http://jejogekatexun.epizy.com/donajosusukarunasuti.pdfIn PDF document text
    • http://lobidirubegevil.epizy.com/85395079645.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_9d78ef09f5f24bc591782e21cb43420a.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_71439d90d32f4df19fe66b8e2b5914ca.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_ac8c2496c3104057b0c9f7e4ed126e0d.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_66f341eef14948a3b9e09648eb74dc2f.pdf?index=trueIn PDF document text
    • http://najusibajeful.rf.gd/fannie_mae_guidelines_401k_loans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ca1f99-4ba4-4106-a811-f63bb4ec790e/33233548.pdfIn PDF document text
    • http://vokuwomibaneseg.epizy.com/chromophore_formation_in_gfp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d6f553-0443-4ac4-a599-e110bc2e9d74/preponderance_of_evidence_definition_blacks_law_dictionary.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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 4892 bytes
SHA-256: ecf7320c03aa6e6a1fb78d8d8b9f6ba76a8a53a4b3c4c5949a368460cef28fd2
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 12604 bytes
SHA-256: 7e27493d0c12fc64c4ccb05bbe563db6603eda213f6394537033dc7b3254f39c

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