Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f9efa066375069…

MALICIOUS

PDF

85.7 KB Created: 2021-02-03 17:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f089c39243f87b47d7e33416a057689 SHA-1: 5fc7b324671e0627dda39b189b54a6e7f640b4a7 SHA-256: 88f9efa066375069419f94eed4dc6586fde5373a313a265f53fc69f698e15705
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a likely attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/aws?utm_term=agile+roles+and+responsibilities+matrix+template In PDF document text
    • http://italia-doc.fun/olha_mein_patola_mp3_song_download_freern3ri.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/rapakuginij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fc8107a43265.pdfIn PDF document text
    • http://help-verification.com/garena_authenticator_security_keyr6xk3.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/fa3683c9c7f900.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/monexilifagup_pizutop_sekarogive_jitokiketez.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/dafes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_6002e2d52dee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62f35a60bd.pdfIn PDF document text
    • http://kengoru.space/hulu_starz_movies_listkw6fq.pdfIn PDF document text
    • http://gallery-shop.site/601067207131oa7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_6001f5608f3a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/fexavujaxizot.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/tamil_christian_songs_keyboard_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/malayalam_movies_box_office_report_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 5476 bytes
SHA-256: 45f3cdc57f9c6bfc1604d3e64f795d8d7fe6a336e12d487d142d5101068bd615
font_01_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 10368 bytes
SHA-256: 317484b45ab6490fe0432518e41a545c93706e678eca1fcbacbb86c5b9de98ab

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