Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fa66a5f88cd56a…

MALICIOUS

PDF

66.0 KB Created: 2021-03-27 21:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ff571230d999a8de9564d1b5064f0c28 SHA-1: b442afae092d38100d37dc118334aab1c568b4c3 SHA-256: f7fa66a5f88cd56ab60983570a15f5d08f0f7fb9a8f421d3fc25efd229c9bac8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan delivery attempt. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an effort to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's primary purpose is to facilitate access to malicious content.

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
  • 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://baarspo.ru/award?keyword=comparative+superlative+adverbs+worksheets+pdf PDF link annotation
    • http://devuweza.scienceontheweb.net/sotopetalafatenixik.pdfIn PDF document text
    • http://mumaposogataj.22web.org/automobilismo_d_epoca_febbraio_2020.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/cd669b02c2601.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/947f1e.pdfIn PDF document text
    • http://susojatafumo.22web.org/lasobo.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/geographical_map_of_europe.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/bezexew.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/53b6a02580b2f.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/autoestima_segun_autores.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/wacker_neuson_spare_parts_catalogue.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/lafezoxibawakenusunu.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/dc45e74a-e349-4a3a-a875-6e3634b4baf3/dusuwakofipemakagi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/83599291674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7180295-f20f-46af-8f1f-e3bb6c859f9a/tapinedupi.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/fepopovezusulude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95378bb4-82ad-4c33-8042-8282b252378e/how_many_questions_on_nclex-rn_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/what_are_the_four_key_goals_of_social_studies.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/requisite_organization.pdfIn PDF document text
    • http://bexasagusive.rf.gd/karisakobiwusezenom.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_off0000c487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC487 5544 bytes
SHA-256: 11b8495de74da46d2543e05e96c8c703c9f34ad40efd70ab2c99955d9a95342b
font_01_sfnt_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 10384 bytes
SHA-256: b59c27f7bf1979b1df1a3fe25afa72c03fdb007bd9a70a6a9bd043ff33233402

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