Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fcb3573eb3a4af…

MALICIOUS

PDF

75.5 KB Created: 2021-04-15 14:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0c2df443e0b287d45cb97f5143e0e3fa SHA-1: c0410831d6d8150d43bdab9b856c3898af4458c8 SHA-256: 49fcb3573eb3a4afb86c4ce5921efa98e30797322212cdaf95607ef0d1de8651
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://druttle.ru/strik?utm_term=how+to+draw+a+simple+tree+without+leaves PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386084/normal_603d4c60a544a.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/can_bus_specification.pdfIn PDF document text
    • http://devlp.design/mimaki_rasterlink_6_profiles81u63.pdfIn PDF document text
    • http://yozi.store/how_to_connect_honeywell_vision_pro_to_wifitw11x.pdfIn PDF document text
    • http://skidki-day.site/swamy_handbook_2017_free_downloadj73h9.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/40k_tyranids_codex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_601e36d436d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_5fe9cd6383db2.pdfIn PDF document text
    • http://maturibcgj.space/critical_ops_hack_freesvk0t.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/92252272136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5ff15457e7f72.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/8a67b200-1f32-48c5-96db-34d267a85746/dark_alliance_firearms_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215537ff-018b-4777-9a93-daf46e73555e/zedubedixojeludoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52009136-285e-4eba-9c56-eec6d1ce7f6c/zulularofonaxerokozaguriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b712d7bc-0ce2-45d3-aa91-7a1188bdec3a/xugoke.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/applying_for_a_job_vocabulary_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d541590-e12a-4d26-af42-17202e491d6e/where_did_thick_as_two_short_planks_come_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5dfb5f-f7e8-4972-807e-10fefc8bfddf/kijenenigokurimafujexilif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac593f38-15ba-4613-a2e9-59a39ab77c3e/towugotemefuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28be8409-7f6a-47dd-9df7-616fac4fc658/ocr_a_level_chemistry_breadth_paper_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22467153-4c63-4718-9363-d55351f79ba3/zokod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bbe21f-6080-4ad1-9e0f-c8973655a557/what_is_a_greek_or_latin_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259df0d1-2193-4f6d-8332-b7c4f621e83c/9118219493.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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5312 bytes
SHA-256: 7dd2003a9d3d2d0f799b69e14ead0e20536aaed2d22aaad44727a0b380cebf9a
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10184 bytes
SHA-256: e6787cdf5f627d372bf20800357ef63b6956455e8472baa639d89aa359953b6b