Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c261dd1d740c8dc…

MALICIOUS

PDF

86.5 KB Created: 2021-03-18 09:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e7ef32f21ef3452c99fd3520dc2c52c0 SHA-1: f521ba1a7c21a20ec71d22f0d0fff26d934fef42 SHA-256: 1c261dd1d740c8dc8dd3847d1759937adbfe0c8f7e0afc7f3474354622542506
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF 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 pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The primary URL observed is 'https://dugedepap.ru/award?keyword=cahier+des+charges+garderie+scolaire+tunisie+pdf', which is likely part of a phishing or malware distribution scheme.

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
  • 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://dugedepap.ru/award?keyword=cahier+des+charges+garderie+scolaire+tunisie+pdf PDF link annotation
    • http://bitcoinlearningcentre.online/56391829731y63q2.pdfIn PDF document text
    • http://vikeman.iblogger.org/85915297580.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/23509192225ougfj.pdfIn PDF document text
    • http://uspeh.icu/43762773004yebc0.pdfIn PDF document text
    • http://damalakin.22web.org/apa_referencing_guide_book_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_f921fdea943244398073ef3c8286c3d9.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_3d91bfcc4b7d4d0393defc837eafc813.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_180676b928d04141a996e07f1bd7dae0.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_3ab0133b1a5942fcb293655b876a1a2e.pdf?index=trueIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_988c88099be4408ca40a4a8a4b48dd83.pdf?index=trueIn PDF document text
    • http://zijegoragakodis.epizy.com/adobe_premiere_pro_cs5_free_download_for_windows_7_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/10566486858.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/doj_guidelines_fcpa.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_fc22b169d83c4f44b2824538df47d964.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/hwy_401_traffic_report.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_21494a6255234671b01c6957d50897e2.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_7d8407ff56c949b7a9618446fdae7e1e.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_406efc3644514dddb46221abd39a954a.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_9b46378f948442c9a533dc8302602e34.pdf?index=trueIn PDF document text
    • http://baniteb.epizy.com/32278632509.pdfIn PDF document text
    • http://depikurowunegit.epizy.com/nalevawakanoxemogipuki.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_3670f84acf4e426b9135393b4fd146da.pdf?index=trueIn 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_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 5320 bytes
SHA-256: 0344a807503835962051542e0a7fa9c842424279013f52dfe711e2f1f4f946e7
font_01_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 14412 bytes
SHA-256: a019c2f6294a0a30f510cdb8596557df210b802683138139326e2f8d4c4723d1