Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ef761767d359dd…

MALICIOUS

PDF

97.2 KB Created: 2021-04-26 09:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b8efecad526338dc47a5ca5fa97abe04 SHA-1: d2ebf3ba1983e15659183c90f73726c54a0e3a3d SHA-256: 68ef761767d359dd327c83a1f2053f615b2ad7a682fc72abccc369063100d733
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=top+5+graphic+design+books PDF link annotation
    • http://wepovak.iblogger.org/commercial_appraisal_report_template.pdfIn PDF document text
    • http://parujom.iblogger.org/99685520921.pdfIn PDF document text
    • http://dadefuxafovub.22web.org/install_airshou_android.pdfIn PDF document text
    • http://wisajekunitope.22web.org/sufuf.pdfIn PDF document text
    • http://dokeximikeveved.iblogger.org/revelation_song_violin_sheet_music.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/2de0158e-6339-47ee-92b9-2b077d0f80da/insinkerator_model_5-84_manual.pdfIn PDF document text
    • http://xamawesurasido.epizy.com/feviwaboxitibaka.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/career_of_evil_book_series.pdfIn PDF document text
    • http://fenetidataj.rf.gd/15613074803.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/judosomijafotosonakaj.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_d5b0c1435d5c43e595926cff77c22187.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb0b3f3-4409-461d-b341-615ca457e3f4/fezivunixozaruzufafozesi.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/64469738449.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_ee237762c06c4e288c9cde43718a1ce8.pdf?index=trueIn PDF document text
    • http://gunijeru.rf.gd/wewevupiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7347492-07bf-4ccc-bd0d-3ec5a4a8ac72/iso_22000_haccp_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/gander_weather_report.pdfIn PDF document text
    • http://zezogif.rf.gd/academic_vocabulary_word_list.pdfIn PDF document text
    • http://fenozenexow.epizy.com/xanathar_s_guide_to_everything_downtime_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b5397f-68ae-4c11-a057-b594e617cbae/dusikobegajene.pdfIn PDF document text
    • http://gefetela.epizy.com/1496819977.pdfIn PDF document text
    • http://gipizaz.rf.gd/84751392716.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_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 5580 bytes
SHA-256: 9d9abc6db87badb91394f635095e5f4cdfc248030719497a7dfbb7e57afeb943
font_01_sfnt_off0001514e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 11300 bytes
SHA-256: bb8d2a0a9e4cf827ea5561fd086172b7f6e2f19a4cfd9084b92f7e4b6869cd23

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