Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7d40afdc68a7b2…

MALICIOUS

PDF

82.7 KB Created: 2021-03-15 20:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0607dfeb1420c78c913c39c55e952e43 SHA-1: f905651d96651370a2c309988e66002b093a89a9 SHA-256: 4e7d40afdc68a7b221cb311690ca8dabb75246e66f660edc15dba424bb348d32
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. The PDF contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The embedded content, though heavily obfuscated, appears to be part of this redirection scheme, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=auditorias+internas+y+externas+de+calidad+pdf PDF link annotation
    • https://cdn.sqhk.co/kafufojugure/Ijejjii/17642472189.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/wxq9hia/zimsec_history_green_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/6ifbpie/97932123099.pdfIn PDF document text
    • http://trackcreditscore.info/54775338479yu69q.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/ijifQv9/digicel_group_jamaica_address.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/o2h5hhq/29859336261.pdfIn PDF document text
    • https://cdn.sqhk.co/nejuvudojo/S3hdgh7/budubilokenu.pdfIn PDF document text
    • http://watertea.space/la_cucaracha_horn_free_ringtoneyq9yq.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/QAJjij7/mother_life_simulation_games_pc.pdfIn PDF document text
    • http://rotepojisox.iblogger.org/arirang_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/whdFiiO/zemugezu.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/7hfhhgg/65253817958.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/68297428821.pdfIn PDF document text
    • http://repovor.22web.org/24695954336.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/haidKif/foxurobufemukepuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_2fc8ab868faa4ce4addfcbd446fd3ef4.pdf?index=trueIn PDF document text
    • http://walerofudovewir.rf.gd/65279061496.pdfIn PDF document text
    • http://tituroxir.rf.gd/alternative_dispute_resolution_reviewer_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a29a85c-e590-4de0-9b7f-1ccfdbe66360/tixufufinutopafudibibu.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_7f5eb95708674afda08813cb1a4bcefa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/124c3790-e70c-47c9-9ed9-74eec667eb7a/talajusumekig.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_5dcbe1b706564c449f790d71d4857864.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 5308 bytes
SHA-256: d5b3c5b620f5dbd96d423d728dcd42547fff86e4bfffbe5f42906d787150df50
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 11388 bytes
SHA-256: e24d47c1ae1ebed02d92837cbc249f15518714908cc8bda70447dc267fcf0e9d
font_02_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 16436 bytes
SHA-256: 67a4e889ab588dd96c8a3a19181e740a49beb37369f3b82995f3497790cc8f9a